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Disease is more severe when it hits in the morning, at least in mice.
Germs tiny enough to pass through surgical masks may cause half of all cases.
Infection that recently developed in China shows signs of being easy to spread and hard to kill.
The germ responsible carries genes from other flu viruses.
Critters spread many germs that can sicken each other — and even kill people.
Wildlife can sometimes become infected with germs shed by people.
Researchers create a bacterium that can’t live or reproduce without a stimulant found in soft drinks, chocolate, coffee and tea.
A mysterious infection has been spreading for almost a year.
Strong medicine may have rid a newborn of deadly HIV.
Astronomers say rocky moons orbiting distant planets might support alien life.
A deadly virus can spread through the air from pigs to monkeys.
The sky is full of microscopic life, some of which might even trigger rain or snow.