COVID vaccines must work even better, whether by becoming variant-proof, finding other administration routes, or finding different targets to attack. All of these issues – and more are under investigation.
More than 3 years into the pandemic, finding out how many Americans have long COVID – and what to about it – has proved to be far harder than identifying those infected with the virus who have recovered or died from it.
The incubation period from infection to symptoms or a first positive COVID-19 test has decreased as the coronavirus has evolved, dropping from 5 days to 3.5 days, according to a new study published in JAMA Network Open.