Covid-19 reinfection detected in US patient; saliva tests endorsed

The following is a roundup of some of the latest scientific studies on the novel coronavirus and efforts to find treatments and vaccines for Covid-19, the illness caused by the virus.

And studies often were at risk for bias, or did not detail their methods. “The evidence currently is not strong enough and more studies are urgently needed to be able to say if these tests are good enough to be used in practice,” the research team led by Jonathan Deeks of the University of Birmingham in Britain wrote.

New studies add to data on Covid-19 in children

Children are far less likely than adults to get severe cases of Covid-19, British doctors found. At 138 hospitals in Britain, through June, less than 1% of Covid-19 patients were children, and 99% survived. Those who died had serious underlying health conditions. “We can be quite sure that Covid in itself is not causing harm to children on a significant scale,” said Malcolm Semple of the University of Liverpool, co-author of research published on Thursday in BMJ.

While children’s risk for severe Covid-19 is low, Black children and obese children experienced higher risks. A separate study published on Monday in the journal JAMA Pediatrics suggests the proportion of US children with asymptomatic Covid-19 may be low.

At 28 hospitals, more than 33,000 children were tested during ear, nose and throat appointments or procedures. None were suspected of having the virus. Fewer than 1% were asymptomatically infected. Even without symptoms, infected children can shed virus for weeks, Korean doctors said on Friday in the JAMA Pediatrics.

Covid-19 reinfection detected in US patient; saliva tests endorsed