Ann GibbonsAt a recent symposium on the evolution of infectious diseases, University of California, San Diego (UCSD), pathologist Nissi Varki noted that humans suffer from a long list of deadly diseases—including typhoid fever, cholera, mumps, whooping cough, measles, smallpox, polio, and gonorrhea—that don’t afflict apes and most other mammals.
All of those pathogens follow the same well-trodden pathway to break into our cells: They manipulate sugar molecules called sialic acids.