BIOL 319 Lecture Notes - Lecture 3: Treponema Pallidum, Hospital-Acquired Infection, Focal Infection Theory

• School: Binghamton University
• Department: Biology
• Course: BIOL 319
• Professor: Claudia Martin

Document Summary

Infection: a pathogen or parasite enters or begins to grow in/on a host. Primary pathogens: able to breach defenses of a healthu host. Oppurtunistic pathogens: cause disease only in a compromised host. Latent state: organism is within host but cannot be detected by culture. Id50: the infectious dose for 50% of the test population. Ld50: the lethal dose for 50% of the test population (usually shown in a comparison on a curve) the lower the ld, the more infectious the thing. Noninfectious disease - caused by some other factor -> for example a poison. Communicable or contagious disease - can be spread from host to host -> measles, hepatitis. Non-communicable disease - cannot be spread from host to host -> food poisoning, tetanus, legionellosis. Subactute disease - symptoms between acute and chronic. Latent disease - disease with a period of no symptoms when the causative agent is inactive.