U.S. sociologist Scott Feld wrote, "Your friends have more friends than you do." Feld's so-called friendship paradox states ...

Here is what we know about polio as a disease, its vaccines and the likely number of lives saved through inoculation.

How do climate, evolution, and free-living hosts interact to determine the dynamics of pathogens and the burden of disease? Aa Aa Aa Infectious diseases have long been known to cause devastating ...