Why do some horrible infectious diseases kill an unlucky few and ignore millions of others? Perhaps the most infamous example is Typhoid Mary, a woman who infected approximately 51 people with Salmonella Typhi, though she herself never got sick. Also, did you know that some people are completely resistant to HIV infection? Lucky.
For these people, their favorable fortune is tied to genetics. Increasingly, evidence suggests that the genes we carry around may be just as important in determining the outcome of an infection as the genes the microbes carry around.
Read the full, original story here: Why Do Microbes Kill Some People but Not Others?