19thcentury 2004i-193 20thcentury activism america bacteria biography communicablediseases developing-countries disease-control disease-outbreaks disease-prevention diseaseoutbreaks dr.-paul-farmer emigrationandimmigration epidemics epidemiology fear germs healing healthcare healthcare-policy healthcare-systems history humanitarianism infectious-diseases inspirational medical-anthropology medical-ethics medical-history mountains-beyond-mountains pandemics poverty public-health public-hygiene public-safety quest social-justice sustainable-development tracy-kidder unitedstates vaccination virus wa11aa1m345w2004 world