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Vintage Diseases Making a Comeback
An anonymous reader writes "MSNBC has a piece on a recent resurgence in some old-timey diseases. Mumps, Whooping Cough, and Rickets are making a comeback, back in style like it's 1955." From the article: "Public-health officials certainly weren't expecting to get 'bitten' by mumps this year. Although the virus has been circulating in British kids since 2000, it hadn't caused much trouble in the United States since an outbreak in Kansas 18 years ago. The Midwest is the epicenter again, but the victims are primarily college students, not children. Once a childhood disease, the virus has now taken hold in university towns. That's partly because crowded dorms and cafeterias are breeding grounds for germs that are spread by sneezing and coughing."
It's caused by a lack of vitamin D. Children develop Rickets, typified by "bow bones." Adults get osteomalacia, with an increase in fractures. Rickets has nothing to do with "vintage diseases." All someone has to do to prevent it is a) better diet b) multivitamin c) suntan. mumps, pertussis, etc. are a different story...
It's called herd immunity.
Here are the equations relevant to immunizing a large populace from a disease.
Light a fire for a man and he'll be warm for a day. Light a man on fire and he'll be warm for the rest of his life.