Known as CAL.20C, the variant now accounts for nearly half of COVID-19 cases in Southern California.
You have likely heard that Pfizer's COVID-19 vaccine efficacy is 95%, Moderna's is 94% and Johnson & Johnson's is 66%. But what do these numbers actually mean?
In a study of 43 men who had recovered from COVID-19, nearly 20% had azoospermia, or the total absence of sperm in semen.
Amid a shortage of vaccine supplies and the threat of emerging coronavirus variants, such an approach might provide an answer for both.
Experts are particularly alarmed by this variant because of its potential to "escape" protection from current vaccines.
The vaccine's efficacy was highest in the U.S. and the lowest in South Africa, where a new variant is infecting people.
People who have schizophrenia may be two to three times more likely to die from COVID-19, study suggests.
The case is unusual because the woman had not been previously hospitalized with COVID-19 or put on a ventilator.
There's about a 2.5 per 1 million chance of developing a severe allergic reaction to Moderna's coronavirus vaccine.