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How Dangerous Is the Delta Variant? Here’s What the Science Says

We spoke to UCSF virologist Nadia Roan, PhD, about the latest developments in our knowledge of the Delta variant, including how the new variant spreads so efficiently, whether it causes more serious illness, and why she thinks vaccines will hold the line.

Man holding "Free COVID Vaccine" sign on street

Common COVID-19 Antibiotic No More Effective Than Placebo

A UCSF study has found that the antibiotic azithromycin was no more effective than a placebo in preventing symptoms of COVID-19 among non-hospitalized patients, and may increase their chance of hospitalization, despite widespread prescription of the antibiotic for the disease.

Prescription bottle

No Sign of COVID-19 Vaccine in Breast Milk

Messenger RNA vaccines against COVID-19 were not detected in human milk, according to a small study by UCSF, providing early evidence that the vaccine mRNA is not transferred to the infant.