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This 2020 electron microscope image provided by the National Institute of Allergy and Infectious Diseases - Rocky Mountain Laboratories shows SARS-CoV-2 virus particles, which cause COVID-19.

A cheap antidepressant reduced the need for hospitalization among high-risk adults with COVID-19 in a study that was looking for existing drugs that could be repurposed to treat coronavirus.

Researchers tested the pill used for depression and obsessive-compulsive disorder because it was known to reduce inflammation and looked promising in smaller studies.

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Surgeons attached a pig kidney to a pair of large blood vessels outside the body of a deceased recipient so they could observe it for two days, and the kidney did what it was supposed to do.

Scientists temporarily attached a pig's kidney to a human body and watched it begin to work, a small step in the decades-long quest to one day use animal organs for lifesaving transplants.

Pigs have been the most recent research focus to address the organ shortage, but among the hurdles: A sugar in pig cells, foreign to the human body, causes immediate organ rejection. The kidney for this experiment came from a gene-edited animal, engineered to eliminate that sugar and avoid an immune system attack.

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A scientist holds a drone as he participates in a demonstration of an experiment led by Austrian and Israeli agencies simulating a mission to Mars near Mitzpe Ramon, Israel, Oct. 10, 2021

RAMON CRATER, ISRAEL — From the door of the expedition base, a few small steps to the left an autonomous rover passes by. A few giant leaps to the right is an array of solar panels. The landscape is rocky, hilly, tinged with red. Purposefully it resembles Mars.

Here, in the Ramon Crater in the desert of southern Israel, a team of six - five men and one woman - has begun simulating what it will be like to live for about a month on the red planet.

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Researchers say the bacteria appears to have changed part of the male insects' reproductive biology, so that female mosquitoes that mate with them lay eggs that do not hatch.

SYDNEY —Researchers in Australia have shown a bacteria can sterilize and eradicate a disease-carrying mosquito that is responsible for spreading dengue, yellow fever and Zika.

Three million male Aedes aegypti, or yellow fever mosquitoes, were released in the trial at three sites in Northern Queensland state. They were reared at James Cook University in Cairns and sterilized with a naturally-occurring bacteria called Wolbachia.

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