As omicron variant spreads, hospital patients admitted for other ailments are also testing positive.

The current flu vaccines appear to be a bad match for the dominant strain so far this influenza season. That could lead to a bad flu season onto of a Covid surge.

German drugmaker BioNTech is enrolling patients in a clinical trial to test its mRNA vaccine for colon cancer relapse.

Data from South Africa show the Pfizer vaccine is less effective against the omicron variant. There was a 40-fold reduction in neutralizing antibodies.

Do the vaccines protect against the omicron variant? Lab study results are expected soon, but more research will also be needed.

The FDA authorized Pfizer and Moderna booster shots for all adults. A CDC advisory panel will take up the issue on Friday.

As cases of Covid-19 rise throughout the U.S., health officials warn that an increasing number of fully vaccinated people are being hospitalized going to the ER.

Pfizer is asking the FDA to authorize its booster shot for everyone ages 18 and up. The move would greatly expand booster access in the United States.

Vaccination offers stronger protection against Covid than a previous infection, according to a CDC study.

Are boosters meant to prevent infections? Or to keep people out of the hospital?

Mix and match Covid vaccines could be a reality after an NIH study found them to be safe and effective.