The chicken for sale at your local grocery store isn't like the chicken your grandparents used to eat. They're bigger and more "breasty," says public health journalist Maryn McKenna — and that's by design.
Superbug, a new book by journalist Maryn McKenna, tracks the spread of MRSA, the drug-resistant staph infection that seems to outwit every antibiotic thrown at it. McKenna explains how the bacteria has changed over the past 30 years -- and how a vaccine may be the only way to stop it.