Featured in Omicron
Why healthy, vaccinated people should still care about Omicron
Omicron may be less virulent than previous coronavirus variants, but it’s too early to celebrate
Here’s what the CDC is now saying about masks and respirators
The agency doesn't tell people to stop using cloth coverings, but its updated guidelines do put more oomph behind well-fitted N95 and KN95 masks.
What does it mean for Omicron to peak?
Cases could be leveling off in early Omicron hotspots, but a surge's peak is only known in retrospect.
The ‘Deltacron’ COVID variant almost certainly doesn’t exist
Data errors probably explain signs of a hybrid Delta-Omicron variant.
Omicron is causing record hospitalizations among the young and elderly
Two weeks into 2022, COVID cases and deaths keep climbing.
Why at-home antigen tests might be missing early cases of Omicron
But should you change where you swab? Not yet.
Why it’s so hard to make quick, accurate estimates on new COVID variants
A national sequencing bias likely led to an overestimate of the true prevalence of Omicron.
What to do if you test positive for COVID, were exposed, or have symptoms
Here's why the CDC changed its guidelines.
Omicron isn’t overtaking Delta as quickly as the CDC thought—and that’s bad news
Omicron is not infecting people at the rate officials thought.
Why the CDC just shortened COVID quarantines to 5 days for asymptomatic cases
This change reflects when people are most likely to transmit the coronavirus, the agency says.