A new study explains how gut bacteria can evolve to become more pathogenic, leading to chronic inflammation and associated health problems.

Harvard scientists give their read on recent COVID data from the U.S. and South Africa.

When microplastics carry land-based parasites to the ocean it not only affects the health of wildlife. It can affect our health, too.

Normally land-bound pathogens that cause deadly diseases for both humans and animals can cling to microplastics and end up in your seafood.

Subvariant is rising in the region, but no sign of dramatic surge in cases that other nations have experienced.

As Omicron rapidly recedes, some countries are seeing a new version of the variant, dubbed BA.2

With Omicron on the decline in some states, pandemic experts permit themselves hope, at least for the near term.

Experts say fast-spreading, less severe profile of Omicron is emerging as cases drop in South Africa but warn of challenging weeks ahead.

Early findings on immune escape and transmissibility, combined with danger posed by Delta, heighten urgency of vaccination, testing, other safety measures.