There have now been more than 31 million COVID-19 cases reported worldwide and more than 965,600 deaths.
The Centers for Disease Control and Prevention acknowledged what scientists have been saying for a while: the coronavirus can spread through the air. Then, they took it back.
Single-cell microbes known as bacteria are simpler than most forms of life, yet they are still intriguingly complex.
The guideline change comes after strong criticism from public health experts and a report that the updated guidelines were posted despite objections from CDC scientists.
Other vaccine makers have been criticized for giving too little information on their clinical trials.
It's still too early to recommend that everyone don eyeglasses, goggles or face shields in public to protect against COVID-19.
People who tested positive for COVID-19 were twice as likely to report dining at a restaurant before becoming sick than people who tested negative.
The seasonal flu shot is a yearly vaccine administered to protect against the flu, or influenza. In the United States, flu shots are recommended for everyone ages 6 months and older.