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.
At least 513,000 children in the U.S. have been diagnosed with COVID-19 since the start of the pandemic.
There are over 1,000 lineages of SARS-CoV-2 circulating around the world. Nigerian scientists have found seven in the country and this is important.
Russia's candidate coronavirus vaccine prompted the immune system and didn't show serious adverse events, according to early data.
Physicians are chasing treatment for children with a dangerous COVID-19 syndrome called multisystem inflammatory syndrome.