The testing process for modified vaccines will likely be similar to that of the annual flu shot, FDA says.
The findings highlight "the importance of preventing infections among educators in particular," the authors said.
The FDA statement pours cold water on a theory that the novel coronavirus emerged outside China and was brought in on imported frozen food.
Scientists will vaccinate all the adults in a single city to see whether a COVID-19 vaccine will reduce cases.
The researchers saw "nodules" at the back of patients' eyes, which can be signs of inflammation or direct damage to the eye.
For months, scientists have wondered whether past exposure to seasonal coronaviruses that cause common colds might prevent people from getting a severe case COVID-19.
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.