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COVID-19 was circulating silently in Wuhan even after the city reported no casesThe researchers tested participants' blood samples for antibodies against SARS-CoV-2.
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COVID-19 vaccines may cause allergic reactions in 1 in 100,000 jabsOverall, the benefits of the vaccine outweigh the potential risks, the CDC said.
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10 ways COVID-19 changed the worldHere are just some of the ways COVID-19 changed the world in 2020.
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The strangest medical cases of 2020From 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.
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Antarctica has its 1st COVID-19 outbreakThe outbreak occurred at the a Chilean research base on the Antarctic Peninsula.
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Doctors heard music when checking a man's pulse. Here's why.In addition to the thump thump of the man's heart, doctors heard music when checking his pulse.
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Is the new UK coronavirus variant more contagious?The variant has a mutation that may make the virus "sticker" or allow it to bind more tightly to human cells.
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Deadly 'brain-eating amoeba' has expanded its range northwardYou can thank climate change for this too.
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FDA approves genetically engineered pigs for food and transplantsPigs 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).
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Why an Australian COVID-19 vaccine caused false-positive HIV testsThe vaccine appeared safe and effective, but some participants falsely tested positive for HIV.
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Pfizer's COVID-19 vaccine starts to work just 10 days after 1st doseOverall, the vaccine was 52% effective after the first dose and 95% effective after the second dose.
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Mystery illness sickens more than 300 in IndiaAll patients tested negative for COVID-19.
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Why did this man's urine turn green?After five days in the ICU, a man's urine turned green.
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COVID-19 may have arrived in US by December 2019Researchers studied blood samples from December 2019, and found a small number tested positive for antibodies against the virus.
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AI system solves 50-year-old protein folding problem in hoursThis complex problem that has plagued researchers for decades.
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Ultrasound captures worms squirming in a man's stomachDoctors observed a "tubular ... structure that moved with a curling motion" inside his stomach.
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CDC urges Americans not to travel for Thanksgiving
The safest way to celebrate Thanksgiving is at home with people in your household, the agency said.
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FDA authorizes 1st fully at-home COVID-19 testThe test, made by Lucira Health in California, requires a prescription.
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Olympic officials 'very confident' that next year's games in Tokyo will have spectatorsJapan was scheduled to host the Olympic Games in the summer of 2020, but the coronavirus pandemic forced officials to postpone the competition until 2021.
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Wearing a cloth face mask protects you and others from getting COVID-19, CDC saysCloth face masks offer two-way protection, benefitting both the wearer and those around them.
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Restaurants and gyms drove COVID-19 transmission this springRestaurants were the riskiest venues for transmission, followed by gyms, coffee shops and hotels.
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US tops 10 million coronavirus casesThe country's total now stands at just over 10 million, according to Johns Hopkins University.
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Woman sheds coronavirus for 70 days without symptomsThe researchers say this is the longest anyone has been reported to be contagious with COVID-19 while remaining asymptomatic.
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Possible cause of COVID-19 blood clots foundThese antibodies attack cells in such a way as to promote blood clots.
