The woman may have had a link to another person, who was married to an Ebola survivor and who died a few days previously in Democratic Republic of Congo.

With many millions of people waiting several weeks to receive a second COVID-19 vaccine dose in some countries, experts consider the possibility that SARS-CoV-2 could evolve vaccine resistance.

See a news report on a study of expectant mothers with SARS-CoV-2 infections.

Compared with Zika and cytomegalovirus, the virus that causes COVID-19 appears to have a harder time penetrating the placenta and moving to a woman’s unborn baby.

The virus rarely spreads from mother to child before birth, but it can—and researchers are starting to investigate the path it takes.

SARS-CoV-2 antibodies detected in blood donor samples indicate infections could have occurred in the US more than a month before the first confirmed case, but some experts remain skeptical.

The so-called 614G mutation in the viral spike protein does not appear to cause more severe cases of COVID-19, but multiple studies indicate that it could be more contagious.

Patients’ viral loads are highest within five days of their first symptoms, emphasizing the need to isolate early to prevent transmission.

Whole genome sequencing of the virus infecting the farm animals showed that it spread from the workers to the mink and back, indicating that an animal could serve as a viral reservoir.