HLTB16H3 Lecture Notes - Lecture 9: Contact Tracing, Herd Immunity, Streptococcus Pneumoniae
Document Summary
Week 9: public health in the context of infectious disease. Type of bacteria: bacilli: rod-shaped bacteria (example: tubercle, bacilli, vibrio cholera, cocci: rounder-shaped bacteria (example: streptococci, staphylococci, pneumococci, spirochete: corkscrew-shaped bacteria (example: syphilis) Direct physical contact between infected individual and susceptible host (body surface to body surface) Infectious agent is deposited on surface and survives to be. Droplet transmitted to susceptible host who touches surface. By coughing and sneezing, large droplets can be projected up to 1 meter. Transmitted by aerosols (small droplets) that contain the organism. Single contaminated source spreads infection (common source or point source) Carrier states: example = typhoid mary: carrier state: infected person can transmit disease without showing symptoms, worked as cook for wealthy families, early 20th century. Hltb16: introduction to public health: resisted medical testing and refused to accept results, remained in custody of nyc health department for remainder of life.
