Rachael Rettner

Too bad they'll have trouble mating.

The researchers tested participants' blood samples for antibodies against SARS-CoV-2.

Overall, the benefits of the vaccine outweigh the potential risks, the CDC said.

Here are just some of the ways COVID-19 changed the world in 2020.

From a man with green urine to a teenager with a sewing pin in his heart, a number of intriguing medical cases caught our eye this year.

The outbreak occurred at the a Chilean research base on the Antarctic Peninsula.

In addition to the thump thump of the man's heart, doctors heard music when checking his pulse.

The variant has a mutation that may make the virus "sticker" or allow it to bind more tightly to human cells.

You can thank climate change for this too.

Pigs that have been genetically engineered to be free of a molecule that triggers meat allergies have been approved by the Food and Drug Administration (FDA).

The vaccine appeared safe and effective, but some participants falsely tested positive for HIV.

Overall, the vaccine was 52% effective after the first dose and 95% effective after the second dose.

All patients tested negative for COVID-19.

After five days in the ICU, a man's urine turned green.

Researchers studied blood samples from December 2019, and found a small number tested positive for antibodies against the virus.

This complex problem that has plagued researchers for decades.

Doctors observed a "tubular ... structure that moved with a curling motion" inside his stomach.

The safest way to celebrate Thanksgiving is at home with people in your household, the agency said.

The test, made by Lucira Health in California, requires a prescription.

Japan was scheduled to host the Olympic Games in the summer of 2020, but the coronavirus pandemic forced officials to postpone the competition until 2021.

Cloth face masks offer two-way protection, benefitting both the wearer and those around them.

Restaurants were the riskiest venues for transmission, followed by gyms, coffee shops and hotels.

The country's total now stands at just over 10 million, according to Johns Hopkins University.

The researchers say this is the longest anyone has been reported to be contagious with COVID-19 while remaining asymptomatic.

These antibodies attack cells in such a way as to promote blood clots.