1920s: local health departments, water, milk, training standards, personal hygiene, infectious disease, close-quartered living

2005: APHA relocates its Annual Meeting from New Orleans, La. to Philadelphia, Pa. following widespread devastation left by Hurricane Katrina.

1900-1910s: infectious diseases, municipal health, water, standardization of health data

1900-1910s: infectious diseases, municipal health, water, standardization of health data

1890s: Water pollution, milk sanitation, hygiene education, bacteriology, infectious diseases

Timeline: Memorable Issues of APHA Focus

2006: APHA launches Get Ready campaign.

1999: APHA builds its own building in Washington, D.C.

1997: APHA celebrates its 125th anniversary with 32,000 members; Presidential Citation presented to Nelson Mandela.

1995: Former U.S. president William Jefferson Clinton proclaims the first full week of April as National Public Health Week (NPHW).