Smallpox

http://www.bbc.co.uk/history/historic_figures/jenner_edward.shtml

http://www.jennermuseum.com/vaccination.html

excellent article

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1200696/

Dr Semmelwies

http://qualitysafety.bmj.com/content/13/3/233.full

Marshall and Warren

http://aje.oxfordjournals.org/content/early/2012/03/16/aje.kwr412.full

great timeline

http://en.wikipedia.org/wiki/Timeline_of_peptic_ulcer_disease_and_Helicobacter_pylori

Pellagra

http://www.jameslindlibrary.org/illustrating/articles/joseph-goldbergers-research-on-the-prevention-of-pellagra