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Sperm count, motility may be low for months after COVID-19

Sperm quality is impaired for months for some people after recovery from COVID-19, researchers have found. The semen itself was not...

Coronavirus cases are surging in several U.S. states with relatively high vaccination rates, prompting concern among health officials who...

As Vermont reports higher than ever COVID-19 case rates, state health officials have been trying to understand why. How can a state that...

All three COVID-19 vaccines available to Americans lost some of their protective power, with vaccine efficacy among a large group of...

It's a question that scientists have been trying to answer since the start of the pandemic, one that is central to the rancorous...

The proportion of COVID-19 infections and hospitalizations among vaccinated Pennsylvania residents rose sharply last month. The latest...

Teresa Sperry, a fifth-grader at Hillpoint Elementary School, died last week, just five days after she first began experiencing a...

Amid persistent concerns that the protection offered by COVID-19 vaccines may be waning, a report released Friday by the Centers for...

A U.K. government advisory panel declined to recommend rolling out Covid-19 shots to all adolescents, instead passing the decision to...

The effectiveness of the COVID-19 vaccines against hospitalization appears to drop over time among adults over 75, although it still...

The Delta variant of the coronavirus is known to be more easily transmissible than earlier versions, and now a large UK study suggests...

Pfizer CEO Albert Bourla told Fox News on Tuesday that he believed it was "likely" a vaccine-resistant coronavirus variant would...

SINGAPORE — The 16-year-old teenager who suffered a heart attack six days after receiving his first dose of the Pfizer-BioNTech/Comirnaty...

U.S. health officials are investigating reports that Moderna Inc's COVID-19 vaccine may be linked to a higher risk of a rare heart...

New Zealand will enter a snap nationwide lockdown at its highest level on Tuesday night after a 58-year-old man from Auckland tested...

Americans fully vaccinated against COVID-19 should go back to wearing masks in indoor public places in regions where the coronavirus is...

The data change all time; this is how it is today. Infection rate (as the number of new cases for the week 15/3/21 – 21/3/21 per 100,000...

Pfizer's and Moderna's shots were at least 10 times less effective against variant in a new study. Researchers tested the vaccines on a...

Scientists in Oregon have spotted a homegrown version of a fast-spreading variant of the coronavirus that first surfaced in Britain — but...

COVID-19 has already left a trail of death and despair in Brazil, one of the worst in the world. Now, a year into the pandemic, the...