Attention to the Unseen

STAT reports: Following the news this week of what appears to have been the first confirmed case of a Covid-19 reinfection, other researchers have been coming forward with their own reports. One in Belgium, another in the Netherlands. And now, one in Nevada. What caught experts’ attention about the case of the 25-year-old Reno man was not that he appears to have contracted SARS-CoV-2 (the name of the virus that causes Covid-19) a second time. Rather, it’s that his second…

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The Washington Post reports: As 5,000 students prepared for move-in day at the University of Arizona this week, the school warned they would be tested periodically for the coronavirus. One test, though, doesn’t involve a nose swab. The university is regularly screening the sewage from each dorm, searching for traces of the virus. On Thursday, officials said the technique worked — and possibly prevented a sizable outbreak on campus. When a wastewater sample from one dorm came back positive this…

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When people wear masks, they can still get infected, but they’re more likely to have milder symptoms. Wenmei Zhou/Digital Vision Vectors via Getty Images By Monica Gandhi, University of California, San Francisco Masks slow the spread of SARS-CoV-2 by reducing how much infected people spray the virus into the environment around them when they cough or talk. Evidence from laboratory experiments, hospitals and whole countries show that masks work, and the Centers for Disease Control and Prevention recommends face coverings…

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The New York Times reports: New York City on Tuesday released more than 1.46 million coronavirus antibody test results, the largest number to date, providing more evidence of how the virus penetrated deeply into some lower-income communities while passing more lightly across affluent parts of the city. In one ZIP code in Queens, more than 50 percent of people who had gotten tested were found to have antibodies, a strikingly high rate. But no ZIP code south of 96th Street…

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CNN reports: A recent batch of studies, many early stage and not yet peer reviewed, show that humans have a “robust” immune response to Covid-19 that may protect them from further infection, even if they had mild symptoms. How long that protection lasts is still unclear, but the studies indicate it could last for months. One leading immunologist says the findings provide optimism that people will not have to endure repeated coronavirus infections. It also provides evidence a vaccine might…

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Open windows are the easiest way to ventilate a room. Justin Paget / Digital Vision via Getty Images By Shelly Miller, University of Colorado Boulder The vast majority of SARS-CoV-2 transmission occurs indoors, most of it from the inhalation of airborne particles that contain the coronavirus. The best way to prevent the virus from spreading in a home or business would be to simply keep infected people away. But this is hard to do when an estimated 40% of cases…

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MIT Technology Review reports: The large number of people already infected with the coronavirus in the US has begun to act as a brake on the spread of the disease in hard-hit states. Millions of US residents have been infected by the virus that causes covid-19, and at least 160,000 are dead. One effect is that the pool of susceptible individuals has been depleted in many areas. After infection, it’s believed, people become immune (at least for months), so they…

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The New York Times reports: Skeptics of the notion that the coronavirus spreads through the air — including many expert advisers to the World Health Organization — have held out for one missing piece of evidence: proof that floating respiratory droplets called aerosols contain live virus, and not just fragments of genetic material. Now a team of virologists and aerosol scientists has produced exactly that: confirmation of infectious virus in the air. “This is what people have been clamoring for,”…

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STAT reports: From the moment Covid-19 emerged as a threat, one approach to making drugs to treat or prevent the disease seemed to hold the most promise: They’re known as monoclonal antibodies. Now, scientists are on the brink of getting important data that may indicate whether these desperately needed therapies could be safe and effective. Clinical trials involving a pair of antibodies developed by Regeneron Pharmaceuticals will read out early results in September. A separate effort from Eli Lilly could…

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Are there places in the body where SARS-CoV-2 can hide from the immune system? fotograzia / Getty Images By William Petri, University of Virginia As millions of people are recovering from COVID-19, an unanswered question is the extent to which the virus can “hide out” in seemingly recovered individuals. If it does, could this explain some of the lingering symptoms of COVID-19 or pose a risk for transmission of infection to others even after recovery? I am a physician-scientist of…

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CNBC reports: White House coronavirus advisor Dr. Anthony Fauci said Friday that the chances of scientists creating a highly effective vaccine — one that provides 98% or more guaranteed protection — for the virus are slim. Scientists are hoping for a coronavirus vaccine that is at least 75% effective, but 50% or 60% effective would be acceptable, too, Fauci, director of the National Institute of Allergy and Infectious Diseases, said during a Q&A with the Brown University School of Public…

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