Can Humans Smell Disease?

Humans can smell disease, research suggests.

Studies suggest that humans have the ability to smell disease, which
researchers believe could be a mechanism designed to help healthy
individuals avoid people who are contagious. A 2014 study found that the
T-shirts worn by participants who had been injected with a bacterial toxin
were rated as smelling worse than those worn by participants who had been
injected with salt water. The researchers found that it took about four
hours to activate the immune system enough to be able to smell disease and
that participants whose immune systems were the most sensitive to the toxin
also rated the fabric as smelling the worst.
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