Pfizer takes its shot at a vaccine for evasive superbug

By Julie Steenhuysen CHICAGO (Reuters) – Kathrin Jansen is a microbiologist with at least two breakthrough vaccines to her name: she brought the cervical cancer vaccine Gardasil to market for Merck and helped develop the $4 billion a year pneumonia and meningitis vaccine Prevnar 13 for Pfizer. Jansen's next vaccine success could come by taming the superbug MRSA, a drug-resistant bacterium that she has seen ravage a healthy man up close and personally. Methicillin-resistant Staphylococcus aureus infects an estimated 53 million people globally and costs more than $20 billion a year to treat. …