3. host pathogen interactions

host pathogen interactions

dynamic relationships where hosts and pathogens influence each others survival often leading to disease

host pathogen interactions involve complex

• molecular

• cellular

• immunological

• responses from the hosts immune system to combat invading microbes

pathogens strategies to evade detection

and exploit host resposes

chain of infection

• infectious agent

• reservoir

• port of exit

• mode of transmission

• portal of entry

• susceptible host

reservoir

where the organism lives without causing infections in humans (water/bats/pigs/birds)

port of exit

sneezing

coughing

ingestion

defication

mode of transmission

if someone sneezes on a handle and you touch the handle then touch your mouth, now youre infected

portal of entry

virulance of a pathogen

a virus that infects some one animal does not always infect another, you cant get a dog’s cold
(HIV jumped from monkeys to humans)

the earlier you break the infection chain

the less risky it is to treat the disease