Two copies of the APOE4 variant, which confers a higher risk of dementia, doubles the risk of severe symptoms as a result of infection with SARS-CoV-2, according to a study.

The viral protein known as ORF3b limits the induction of the type I interferon response, which typically alerts other immune system components to the presence of a virus, in cultured cells.

Affectionate touches tap into the nervous system’s rest and digest mode, reducing the release of stress hormones, bolstering the immune system, and stimulating brainwaves linked with relaxation.

A blood biobank allows scientists to study the immune responses to the coronavirus among infected Biogen employees and their contacts.

It can take days for each death to be recorded in official statistics. “Nowcasting” estimates the actual occurrence of deaths, and the true peak of the pandemic.

A clinical trial of the shot in eight volunteers suggests that it is safe and that it generates antibodies that neutralize SARS-CoV-2, but further testing is needed, scientists say.

While the finding doesn’t prove people become immune to the virus after infection, it is good news for vaccine development.

The experiments did not involve SARS-CoV-2, but researchers say the results support precautions to avoid possibly spreading COVID-19 by talking.