BIOL-104 Lecture Notes - Lecture 31: Microcephaly, Herd Immunity
Document Summary
Direct transmission pathogen goes from human to human (ex. influenza, measles) Zoonotic diseases transmit from animal populations to human populations. Vector borne disease pathogen transmits from the host to the human. There are also environmental factors that allow for the spread of these diseases etc. Epidemic- rapid spread of disease to a large number of people in a short period of time. Epidemics have to come back down due to depletion of susceptible individuals if you"(cid:448)e (cid:271)ee(cid:374) i(cid:374)fe(cid:272)ted you"re (cid:374)o lo(cid:374)ger sus(cid:272)epti(cid:271)le. We have recurring epidemics because susceptibles become depleted immunity fades susceptibles are replenished babies without immunity are born. Emergence may be related to changes in the environment, pathogen population, reservoir/vector population, or host population. Urbanization changes the landscape and the way vectors, humans, pathogens interact with each other. Disease e(cid:272)ology is differe(cid:374)t fro(cid:373) epide(cid:373)iology . ki(cid:374)d of. We make mathematical models for the amount of infectious diseases. The most basic framework: susceptible infectious recovered.
