"As these viruses continue to evolve, public health officials watch carefully to see whether new strains will be more easily ...

COVID-19 variant XFG accounted for 0% of U.S. cases in May. By late-June, it became the third-most common strain.

A new variant of the virus that causes COVID-19 is spreading in the U.S., raising concerns about a potential wave of ...

Add Yahoo as a preferred source to see more of our stories on Google. (NewsNation) — As the weather begins to change and respiratory illnesses become more common, a highly transmissible strain of ...

COVID-19 cases were relatively low across the country for most of the summer, but they’re now creeping up again. Data shows that this is thanks to the new COVID-19 variant XFG, nicknamed Stratus, ...

A new COVID-19 variant sweeping through China has yet to make a sizable footprint in the U.S., the Centers for Disease Control and Prevention (CDC) says. In January, a new COVID-19 variant known as NB ...

A fourth dose of bivalent or monovalent BA.1-adapted BNT162b2 vaccines was safe and elicited robust neutralizing responses in ...

As the weather cools and fall approaches, COVID-19 cases are still spiking in much of the United States. The country has yet to emerge from a late summer COVID wave driven by the highly contagious new ...

The first known meta-analysis of how SARS-CoV-2 variant type and time since infection influence long-COVID symptoms ties Omicron to brain fog and paresthesia (numbness and tingling), while earlier ...

Six years after COVID-19 first reached New Zealand, the country is experiencing its ninth wave of infections. But the virus we are living with today behaves very differently from the one that caused ...

Anyone with worsening symptoms should contact their doctor or Healthline. People who have a weakened immune system, high-risk ...

The timing of symptom onset depends on lots of factors, including the amount of virus to which someone was exposed, Hotez ...