<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">\ufeff<base><base><div class="Apple-Mail-URLShareUserContentTopClass"><div style="caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); text-align: center;"><b>This posting have been submitted by a member of Gotham Networking as being useful and worthwhile to share with others.</b></div><div style="caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); text-align: center;"><b><br></b></div><div style="caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); text-align: center;"><b>Gotham Networking has not confirmed the accuracy of what is presented. </b></div><div style="caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); text-align: center;"><b><br></b></div><div style="caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); text-align: center;"><b>Please use your best judgment and guide yourself accordingly.</b></div></div><div class="Apple-Mail-URLShareWrapperClass"><blockquote type="cite" style="border-left-style: none; color: inherit; padding: inherit; margin: inherit;"><div><div class="original-url"><br><a href="https://www.nytimes.com/2020/07/30/health/coronavirus-children.html?campaign_id=57&emc=edit_ne_20200730&instance_id=20847&nl=evening-briefing&regi_id=4405288&segment_id=34835&te=1&user_id=2fc566278f241d61c830bead46040397">https://www.nytimes.com/2020/07/30/health/coronavirus-children.html?campaign_id=57&emc=edit_ne_20200730&instance_id=20847&nl=evening-briefing&regi_id=4405288&segment_id=34835&te=1&user_id=2fc566278f241d61c830bead46040397</a><br><br></div><div id="article" role="article" style="text-rendering: optimizeLegibility; font-family: -apple-system-font; font-size: 1.2em; line-height: 1.5em; margin: 0px; padding: 0px;" class="system exported">
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<div class="page" style="word-wrap: break-word; max-width: 100%;"><h1 class="title" style="font-size: 1.95552em; line-height: 1.2141em; margin-top: 0px; margin-bottom: 0.5em; max-width: 100%;">Children May Carry Coronavirus at High Levels, Study Finds</h1><h2 class="subhead" style="font-weight: normal; color: rgba(27, 27, 27, 0.65); font-size: 1.46664em; margin-top: -0.35em; line-height: 1.27275em; max-width: 100%;">The research does not prove that infected children are contagious, but it should influence the debate about reopening schools, some experts said.</h2><div class="metadata singleline" style="margin-bottom: 1.45em; margin-top: -0.7em; max-width: 100%;"><div style="margin: 0px; max-width: 100%; font-size: 1em !important; display: inline !important;">By<!-- --> <a href="https://www.nytimes.com/by/apoorva-mandavilli" style="margin: 0px; color: rgb(65, 110, 210); max-width: 100%; font-size: 1em !important; display: inline !important;"><span itemprop="name" style="margin: 0px; max-width: 100%; font-size: 1em !important; display: inline !important;">Apoorva Mandavilli</span></a></div><span class="delimiter" style="margin: 0.07em 0.45em 0px; max-width: 100%; padding: 0px; font-size: 1em !important; display: inline !important;"></span><time datetime="2020-07-30T13:04:00-04:00" class="date" style="margin: 0px; max-width: 100%; font-size: 1em !important; display: inline !important;">Updated <span style="margin: 0px; max-width: 100%; font-size: 1em !important;">1:04 p.m. ET</span></time></div><div style="max-width: 100%;"><header style="max-width: 100%;"><div data-testid="photoviewer-wrapper" style="max-width: 100%;"><div data-testid="photoviewer-children" style="max-width: 100%;"><figure aria-label="media" role="group" itemscope="" itemprop="associatedMedia" itemid="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN1/30VIRUS-CHILDREN1-articleLarge.jpg?quality=90&auto=webp" itemtype="http://schema.org/ImageObject" style="max-width: 100%; font-size: 0.75em; line-height: 1.5em; color: rgba(0, 0, 0, 0.65); margin: 0px;"><div style="max-width: 100%;"><picture style="max-width: 100%;"><source media="(max-width: 599px) and (min-device-pixel-ratio: 3),(max-width: 599px) and (-webkit-min-device-pixel-ratio: 3),(max-width: 599px) and (min-resolution: 3dppx),(max-width: 599px) and (min-resolution: 288dpi)" srcset="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN1/30VIRUS-CHILDREN1-mobileMasterAt3x.jpg?quality=75&auto=webp&disable=upscale&width=600" style="max-width: 100%;"><source media="(max-width: 599px) and (min-device-pixel-ratio: 2),(max-width: 599px) and (-webkit-min-device-pixel-ratio: 2),(max-width: 599px) and (min-resolution: 2dppx),(max-width: 599px) and (min-resolution: 192dpi)" srcset="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN1/30VIRUS-CHILDREN1-mobileMasterAt3x.jpg?quality=75&auto=webp&disable=upscale&width=1200" style="max-width: 100%;"><source media="(max-width: 599px) and (min-device-pixel-ratio: 1),(max-width: 599px) and (-webkit-min-device-pixel-ratio: 1),(max-width: 599px) and (min-resolution: 1dppx),(max-width: 599px) and (min-resolution: 96dpi)" srcset="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN1/30VIRUS-CHILDREN1-mobileMasterAt3x.jpg?quality=75&auto=webp&disable=upscale&width=1800" style="max-width: 100%;"><img alt="Coronavirus testing at a mobile clinic at the Walker Temple A.M.E. Church in south Los Angeles earlier this month." src="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN1/30VIRUS-CHILDREN1-articleLarge.jpg?quality=75&auto=webp&disable=upscale" srcset="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN1/30VIRUS-CHILDREN1-articleLarge.jpg?quality=90&auto=webp 600w,https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN1/30VIRUS-CHILDREN1-jumbo.jpg?quality=90&auto=webp 1024w,https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN1/30VIRUS-CHILDREN1-superJumbo.jpg?quality=90&auto=webp 2048w" sizes="((min-width: 600px) and (max-width: 1004px)) 84vw, (min-width: 1005px) 60vw, 100vw" decoding="async" itemprop="url" itemid="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN1/30VIRUS-CHILDREN1-articleLarge.jpg?quality=75&auto=webp&disable=upscale" style="max-width: 100%; margin: 0.5em auto; display: block; height: auto;" data-unique-identifier=""></picture></div><figcaption itemprop="caption description" style="max-width: 100%; margin-top: 0.8em; width: 100%; font-size: 0.75rem; color: rgba(0, 0, 0, 0.8);"><span aria-hidden="true" style="max-width: 100%; margin-top: 0.25em; margin-bottom: 0.25em;">Coronavirus testing at a mobile clinic at the Walker Temple A.M.E. Church in south Los Angeles earlier this month.</span><span itemprop="copyrightHolder" style="max-width: 100%; margin-top: 0.25em; margin-bottom: 0.25em;"><span style="max-width: 100%;"><span style="max-width: 100%;">Mario Tama/Getty Images</span></span></span></figcaption></figure></div></div></header></div><section name="articleBody" itemprop="articleBody" style="max-width: 100%;"><div style="max-width: 100%;"><div style="max-width: 100%;"><p style="max-width: 100%;">It has been a comforting refrain in the national conversation about reopening schools: Young children are mostly spared by the coronavirus and don\u2019t seem to spread it to others, at least not very often.</p><p style="max-width: 100%;">But on Thursday, a study introduced an unwelcome wrinkle into this smooth narrative.</p><p style="max-width: 100%;"><b>Infected children <a href="https://jamanetwork.com/journals/jamapediatrics/fullarticle/2768952" title="" rel="noopener noreferrer" target="_blank" style="color: rgb(65, 110, 210); max-width: 100%;">have at least as much of the coronavirus in their noses and throats</a> as infected adults, according to the research. Indeed, children younger than age 5 may host up to 100 times as much of the virus in the upper respiratory tract as adults, the authors found.</b></p><p style="max-width: 100%;">That measurement does not necessarily prove children are passing the virus to others. Still, the findings should influence the debate over reopening schools, several experts said.</p><p style="max-width: 100%;">\u201cThe school situation is so complicated \u2014 there are many nuances beyond just the scientific one,\u201d said Dr. Taylor Heald-Sargent, a pediatric infectious diseases expert at the Ann and Robert H. Lurie Children\u2019s Hospital of Chicago, who led the study, published in JAMA Pediatrics.</p></div></div><div style="max-width: 100%;"><div style="max-width: 100%;"><p style="max-width: 100%;">\u201cBut one takeaway from this is that we can\u2019t assume that just because kids aren\u2019t getting sick, or very sick, that they don\u2019t have the virus.\u201d</p><p style="max-width: 100%;">The study is not without caveats: It was small, and did not specify the participants\u2019 race or sex, or whether they had underlying conditions. The tests looked for viral RNA, genetic pieces of the coronavirus, rather than the live virus itself. (Its genetic material is RNA, not DNA.)</p><p style="max-width: 100%;">Still, experts were alarmed to learn that young children may carry significant amounts of the coronavirus.</p><p style="max-width: 100%;">\u201cI\u2019ve heard lots of people saying, \u2018Well, kids aren\u2019t susceptible, kids don\u2019t get infected.\u2019 And this clearly shows that\u2019s not true,\u201d said Stacey Schultz-Cherry, a virologist at St. Jude Children\u2019s Research Hospital.</p><p style="max-width: 100%;">\u201cI think this is an important, really important, first step in understanding the role that kids are playing in transmission.\u201d</p></div></div><div style="max-width: 100%;"><div style="max-width: 100%;"><p style="max-width: 100%;">Jason Kindrachuk, a virologist at the University of Manitoba, said: \u201cNow that we\u2019re rolling into the end of July and looking at trying to open up schools the next month, this really needs to be considered.\u201d</p><p style="max-width: 100%;">The standard diagnostic test amplifies the virus\u2019s genetic material in cycles, with the signal growing brighter each round. The more virus present in the swab initially, the fewer cycles needed for a clear result.</p><p style="max-width: 100%;">Dr. Heald-Sargent, who has a research interest in coronaviruses, began noticing that children\u2019s tests were coming back with low \u201ccycle thresholds,\u201d or C.T.s, suggesting that their samples were teeming with the virus.</p><p style="max-width: 100%;">Intrigued, she called the hospital lab on a Sunday and asked to look back at test results for the past several weeks. \u201cIt wasn\u2019t even something we had set out to look for,\u201d she said.</p><p style="max-width: 100%;">She and her colleagues analyzed samples collected with nasopharyngeal swabs between March 23 and April 27 at drive-through testing sites in Chicago and from people who came to the hospital for any reason, including symptoms of Covid-19.</p><p style="max-width: 100%;">They looked at swabs taken from 145 people: 46 children younger than age 5; 51 children aged 5 to 17; and 48 adults aged 18 to 65. To forestall criticisms that really ill children would be expected to have a lot of the virus, the team excluded children who needed oxygen support. Most of the children in the study reported only a fever or cough, Dr. Heald-Sargent said.</p><p style="max-width: 100%;">To compare the groups fairly, the team included only children and adults who had mild to moderate symptoms and for whom they had information about when symptoms began. Dr. Heald-Sargent left out people who didn\u2019t have symptoms and who did not remember when they had started to feel ill, as well as those who had symptoms for more than a week before the testing.</p></div></div><div style="max-width: 100%;"><div style="max-width: 100%;"><p style="max-width: 100%;">The results confirmed Dr. Heald-Sargent\u2019s hunch: Older children and adults had similar C.T.s, with a median of about 11 and ranging up to 17. But children younger than age 5 had significantly lower C.T.s of about 6.5. The upper limit of the range in these children was a C.T. of 12, however \u2014 still comparable to those of older children and adults.</p><p style="max-width: 100%;">\u201cIt definitely shows that kids do have levels of virus similar to and maybe even higher than adults,\u201d Dr. Heald-Sargent said. \u201cIt wouldn\u2019t be surprising if they were able to shed\u201d the virus and spread it to others.</p></div></div><div data-testid="photoviewer-wrapper" style="max-width: 100%;"><div data-testid="photoviewer-children" style="max-width: 100%;"><figure aria-label="media" role="group" itemprop="associatedMedia" itemscope="" itemid="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN2/merlin_171979788_859ad6e5-7a26-4f54-ab55-3acbf62e70b6-articleLarge.jpg?quality=90&auto=webp" itemtype="http://schema.org/ImageObject" style="max-width: 100%; font-size: 0.75em; line-height: 1.5em; color: rgba(0, 0, 0, 0.65); margin: 0px;"><div style="max-width: 100%;"><picture style="max-width: 100%;"><source media="(max-width: 599px) and (min-device-pixel-ratio: 3),(max-width: 599px) and (-webkit-min-device-pixel-ratio: 3),(max-width: 599px) and (min-resolution: 3dppx),(max-width: 599px) and (min-resolution: 288dpi)" srcset="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN2/merlin_171979788_859ad6e5-7a26-4f54-ab55-3acbf62e70b6-mobileMasterAt3x.jpg?quality=75&auto=webp&disable=upscale&width=600" style="max-width: 100%;"><source media="(max-width: 599px) and (min-device-pixel-ratio: 2),(max-width: 599px) and (-webkit-min-device-pixel-ratio: 2),(max-width: 599px) and (min-resolution: 2dppx),(max-width: 599px) and (min-resolution: 192dpi)" srcset="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN2/merlin_171979788_859ad6e5-7a26-4f54-ab55-3acbf62e70b6-mobileMasterAt3x.jpg?quality=75&auto=webp&disable=upscale&width=1200" style="max-width: 100%;"><source media="(max-width: 599px) and (min-device-pixel-ratio: 1),(max-width: 599px) and (-webkit-min-device-pixel-ratio: 1),(max-width: 599px) and (min-resolution: 1dppx),(max-width: 599px) and (min-resolution: 96dpi)" srcset="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN2/merlin_171979788_859ad6e5-7a26-4f54-ab55-3acbf62e70b6-mobileMasterAt3x.jpg?quality=75&auto=webp&disable=upscale&width=1800" style="max-width: 100%;"><img alt="\u201cOne takeaway from this is that we can\u2019t assume that just because kids aren\u2019t getting sick, or very sick, that they don\u2019t have the virus,\u201d said one infectious disease expert." src="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN2/merlin_171979788_859ad6e5-7a26-4f54-ab55-3acbf62e70b6-articleLarge.jpg?quality=75&auto=webp&disable=upscale" srcset="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN2/merlin_171979788_859ad6e5-7a26-4f54-ab55-3acbf62e70b6-articleLarge.jpg?quality=90&auto=webp 600w,https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN2/merlin_171979788_859ad6e5-7a26-4f54-ab55-3acbf62e70b6-jumbo.jpg?quality=90&auto=webp 1024w,https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN2/merlin_171979788_859ad6e5-7a26-4f54-ab55-3acbf62e70b6-superJumbo.jpg?quality=90&auto=webp 2048w" sizes="((min-width: 600px) and (max-width: 1004px)) 84vw, (min-width: 1005px) 60vw, 100vw" decoding="async" itemprop="url" itemid="https://static01.nyt.com/images/2020/07/30/science/30VIRUS-CHILDREN2/merlin_171979788_859ad6e5-7a26-4f54-ab55-3acbf62e70b6-articleLarge.jpg?quality=75&auto=webp&disable=upscale" style="max-width: 100%; margin: 0.5em auto; display: block; height: auto;" data-unique-identifier=""></picture></div><figcaption style="max-width: 100%; margin-top: 0.8em; width: 100%; font-size: 0.75rem; color: rgba(0, 0, 0, 0.8);"><span aria-hidden="true" style="max-width: 100%; margin-top: 0.25em; margin-bottom: 0.25em;">\u201cOne takeaway from this is that we can\u2019t assume that just because kids aren\u2019t getting sick, or very sick, that they don\u2019t have the virus,\u201d said one infectious disease expert.</span><span itemprop="copyrightHolder" style="max-width: 100%; margin-top: 0.25em; margin-bottom: 0.25em;"><span style="max-width: 100%;">Tom Brenner/Reuters</span></span></figcaption></figure></div></div><div style="max-width: 100%;"><div style="max-width: 100%;"><p style="max-width: 100%;">The results are consistent with those from a German <a href="https://www.nytimes.com/2020/05/05/health/coronavirus-children-transmission-school.html" title="" style="color: rgb(65, 110, 210); max-width: 100%;">study of 47 infected children</a> between the ages 1 and 11, which showed that children who did not have symptoms had viral loads as high as adults\u2019, or higher. And a recent study from France found that asymptomatic children had <a href="https://academic.oup.com/cid/article/doi/10.1093/cid/ciaa1044/5876373" title="" rel="noopener noreferrer" target="_blank" style="color: rgb(65, 110, 210); max-width: 100%;">C.T. values similar</a> to those of children with symptoms.</p><p style="max-width: 100%;">C.T. values are a reasonable proxy for the amount of coronavirus present, said Dr. Kindrachuk, who relied on this metric during the Ebola outbreaks in West Africa.</p><div style="max-width: 100%;"><div style="max-width: 100%;"><section style="max-width: 100%;"><div style="max-width: 100%;"><div role="complementary" data-storyline="The Coronavirus Outbreak" data-truncated="true" tabindex="0" style="max-width: 100%;"><div style="max-width: 100%;"><div style="max-width: 100%;"><a href="https://www.nytimes.com/news-event/coronavirus?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;"><h3 style="font-size: 1.25em; max-width: 100%;">The Coronavirus Outbreak \u203a</h3></a><h4 style="font-size: 1em; margin: 1em 0px; max-width: 100%;">Frequently Asked Questions</h4><p style="max-width: 100%;">Updated July 27, 2020</p><ul class="list-style-type-none" style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><h4 style="font-size: 1em; margin: 1em 0px; max-width: 100%;">Should I refinance my mortgage?</h4><ul class="list-style-type-none" style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><a href="https://www.nytimes.com/article/coronavirus-money-unemployment.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">It could be a good idea,</a> because mortgage rates have <a href="https://www.nytimes.com/2020/07/16/business/mortgage-rates-below-3-percent.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">never been lower.</a> Refinancing requests have pushed mortgage applications to some of the highest levels since 2008, so be prepared to get in line. But defaults are also up, so if you\u2019re thinking about buying a home, be aware that some lenders have tightened their standards.</li></ul></li><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><h4 style="font-size: 1em; margin: 1em 0px; max-width: 100%;">What is school going to look like in September?</h4><ul class="list-style-type-none" style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;">It is unlikely that many schools will return to a normal schedule this fall, requiring the grind of <a href="https://www.nytimes.com/2020/06/05/us/coronavirus-education-lost-learning.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">online learning</a>, <a href="https://www.nytimes.com/2020/05/29/us/coronavirus-child-care-centers.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">makeshift child care</a> and <a href="https://www.nytimes.com/2020/06/03/business/economy/coronavirus-working-women.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">stunted workdays</a> to continue. California\u2019s two largest public school districts \u2014 Los Angeles and San Diego \u2014 said on July 13, that <a href="https://www.nytimes.com/2020/07/13/us/lausd-san-diego-school-reopening.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">instruction will be remote-only in the fall</a>, citing concerns that surging coronavirus infections in their areas pose too dire a risk for students and teachers. Together, the two districts enroll some 825,000 students. They are the largest in the country so far to abandon plans for even a partial physical return to classrooms when they reopen in August. For other districts, the solution won\u2019t be an all-or-nothing approach. <a href="https://bioethics.jhu.edu/research-and-outreach/projects/eschool-initiative/school-policy-tracker/" style="color: rgb(65, 110, 210); max-width: 100%;">Many systems</a>, including the nation\u2019s largest, New York City, are devising <a href="https://www.nytimes.com/2020/06/26/us/coronavirus-schools-reopen-fall.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">hybrid plans</a> that involve spending some days in classrooms and other days online. There\u2019s no national policy on this yet, so check with your municipal school system regularly to see what is happening in your community.</li></ul></li><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><h4 style="font-size: 1em; margin: 1em 0px; max-width: 100%;">Is the coronavirus airborne?</h4><ul class="list-style-type-none" style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;">The coronavirus <a href="https://www.nytimes.com/2020/07/04/health/239-experts-with-one-big-claim-the-coronavirus-is-airborne.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">can stay aloft for hours in tiny droplets in stagnant air</a>, infecting people as they inhale, mounting scientific evidence suggests. This risk is highest in crowded indoor spaces with poor ventilation, and may help explain super-spreading events reported in meatpacking plants, churches and restaurants. <a href="https://www.nytimes.com/2020/07/06/health/coronavirus-airborne-aerosols.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">It\u2019s unclear how often the virus is spread</a> via these tiny droplets, or aerosols, compared with larger droplets that are expelled when a sick person coughs or sneezes, or transmitted through contact with contaminated surfaces, said Linsey Marr, an aerosol expert at Virginia Tech. Aerosols are released even when a person without symptoms exhales, talks or sings, according to Dr. Marr and more than 200 other experts, who <a href="https://academic.oup.com/cid/article/doi/10.1093/cid/ciaa939/5867798" style="color: rgb(65, 110, 210); max-width: 100%;">have outlined the evidence in an open letter to the World Health Organization</a>.</li></ul></li><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><h4 style="font-size: 1em; margin: 1em 0px; max-width: 100%;">What are the symptoms of coronavirus?</h4><ul class="list-style-type-none" style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;">Common symptoms <a href="https://www.nytimes.com/article/symptoms-coronavirus.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">include fever, a dry cough, fatigue and difficulty breathing or shortness of breath.</a> Some of these symptoms overlap with those of the flu, making detection difficult, but runny noses and stuffy sinuses are less common. <a href="https://www.nytimes.com/2020/04/27/health/coronavirus-symptoms-cdc.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq" style="color: rgb(65, 110, 210); max-width: 100%;">The C.D.C. has also</a> added chills, muscle pain, sore throat, headache and a new loss of the sense of taste or smell as symptoms to look out for. Most people fall ill five to seven days after exposure, but symptoms may appear in as few as two days or as many as 14 days.</li></ul></li><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><h4 style="font-size: 1em; margin: 1em 0px; max-width: 100%;">Does asymptomatic transmission of Covid-19 happen?</h4><ul class="list-style-type-none" style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;"><li style="max-width: 100%; list-style-type: none; padding-inline-start: 0px;">So far, the evidence seems to show it does. A widely cited <a href="https://www.nature.com/articles/s41591-020-0869-5" style="color: rgb(65, 110, 210); max-width: 100%;">paper</a> published in April suggests that people are most infectious about two days before the onset of coronavirus symptoms and estimated that 44 percent of new infections were a result of transmission from people who were not yet showing symptoms. Recently, a top expert at the World Health Organization stated that transmission of the coronavirus by people who did not have symptoms was \u201cvery rare,\u201d <a href="https://www.nytimes.com/2020/06/09/world/coronavirus-updates.html?action=click&pgtype=Article&state=default&module=styln-coronavirus&region=MAIN_CONTENT_3&context=storylines_faq#link-1f302e21" style="color: rgb(65, 110, 210); max-width: 100%;">but she later walked back that statement.</a></li></ul></li></ul></div></div></div></div></section></div></div><p style="max-width: 100%;">Still, he and others said that ideally researchers would grow infectious virus from samples, rather than test only for the virus\u2019s RNA.</p><p style="max-width: 100%;">\u201cI suspect that it probably will translate into meaning that there is more actual virus there as well, but we can\u2019t say that without seeing the data,\u201d said Juliet Morrison, a virologist at the University of California, Riverside.</p></div></div><div style="max-width: 100%;"><div style="max-width: 100%;"><p style="max-width: 100%;">Some RNA viruses multiply quickly and are prone to genetic errors that render the virus incapable of infecting cells. Some RNA detected in children may represent these \u201cdefective\u201d viruses: \u201cWe need to understand how much of that is actually infectious virus,\u201d Dr. Schultz-Cherry said.</p><p style="max-width: 100%;">(The researchers said they did not have access to the type of high-security lab required to grow infectious coronavirus, but other teams <a href="https://pubmed.ncbi.nlm.nih.gov/32603290/" title="" rel="noopener noreferrer" target="_blank" style="color: rgb(65, 110, 210); max-width: 100%;">have cultivated virus</a> from children\u2019s samples.)</p><p style="max-width: 100%;">The experts all emphasized that the findings at least indicate that children can be infected. Those who harbor a lot of virus may spread it to others in their households, or to teachers and other school staff members when schools reopen.</p><p style="max-width: 100%;">Many school districts are planning to protect students and staff members by implementing physical distancing, cloth face coverings and hand hygiene. But it\u2019s unclear how well staff members and teachers can keep young children from getting too close to others, Dr. Kindrachuk said.</p><p style="max-width: 100%;">\u201cFrankly, I just haven\u2019t seen a lot of discussion about how that aspect is going to be controlled,\u201d he said.</p><p style="max-width: 100%;"><strong style="max-width: 100%;"><em style="max-width: 100%;">[</em></strong><strong style="max-width: 100%;"><a href="http://on.fb.me/1paTQ1h" title="" rel="noopener noreferrer" target="_blank" style="color: rgb(65, 110, 210); max-width: 100%;"><em style="max-width: 100%;">Like the Science Times page on Facebook.</em></a></strong><strong style="max-width: 100%;"><em style="max-width: 100%;"> </em></strong><em style="max-width: 100%;">| Sign up for the </em><strong style="max-width: 100%;"><a href="http://nyti.ms/1MbHaRU" title="" rel="noopener noreferrer" target="_blank" style="color: rgb(65, 110, 210); max-width: 100%;"><em style="max-width: 100%;">Science Times newsletter.</em></a></strong><strong style="max-width: 100%;"><em style="max-width: 100%;">]</em></strong></p><p style="max-width: 100%;">Observations from schools in several countries have suggested that, at least in places with mild outbreaks and preventive measures in place, children do not seem to spread the coronavirus to others efficiently.</p><p style="max-width: 100%;">Strong immune responses in children could limit both how much virus they can spread to others and for how long. The children\u2019s overall health, underlying conditions such as obesity or diabetes, and sex may also influence the ability to transmit the virus.</p></div></div><div style="max-width: 100%;"><div style="max-width: 100%;"><p style="max-width: 100%;">Some experts have suggested that children <a href="https://www.nytimes.com/2020/06/30/us/coronavirus-schools-reopening-guidelines-aap.html" title="" style="color: rgb(65, 110, 210); max-width: 100%;">may transmit less virus</a> because of their smaller lung capacity, height or other physical aspects.</p><p style="max-width: 100%;">Dr. Morrison dismissed those suggestions. The virus is shed from the upper respiratory tract, not the lungs, she noted.</p><p style="max-width: 100%;">\u201cWe are going to be reopening day care and elementary schools,\u201d she said. If these results hold up, \u201cthen yeah, I\u2019d be worried.\u201d</p></div></div></section></div></div></div></blockquote></div><br><br><div>
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-webkit-nbsp-mode: space; line-break: after-white-space;"><div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><span class="Apple-style-span" style="border-collapse: separate; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><div><div align="CENTER"><div style="text-align: -webkit-auto;"><div align="CENTER"><div style="text-align: start;"><div align="CENTER" style="font-family: Helvetica; font-weight: normal; font-style: normal; color: rgb(0, 0, 0);"><font face="Times New Roman"><font size="4"><b><font class="Apple-style-span" color="#1c39f6">Corey B. 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