HSCI 130 Lecture Notes - Lecture 7: Natural Experiment, Varicella Vaccine, Cumulative Incidence

• School: Simon Fraser University
• Department: Health Sciences
• Course: HSCI 130
• Professor: Rochelle Tucker

Document Summary

1854: snow begins investigation of cholera; documenting the source of the drinking water for people dying from cholera - natural experiment. Snow begins investigation of cholera documenting source. Snow"s theory leads him to an investigation of water pumps. Examination of deaths occurring in 2nd week of september. Most people had symptoms starting september 1-2. Map of deaths distance to pump. Symptoms: fever, hypotension, rash, peeling of hands, fingers and toes. 50 cases reported to cdc in atlanta. Associated with menstrual periods: cases more likely to use tampons. Case-control study: women who used rely tampons 8x more likely to get. 35% of people infected above became ill over 3 day period from august 30- Exam tip: draw pies on exam, so you don"t get confused. Point prevalence: the proportion of individuals in a population with the disease at a given p oint in time (ex.