Parasites, Pathogens, Disease (W7-L1)

Organism that exploits another living organism, called the host, causing it some degree of harm

Live inside the host ex. Worms, Protozoa

Parasites that live on the host ex. ticks, lices

Type of parasite that includes bacteria, viruses

Host used by the parasite before it reaches the primary host ex. Guiniea Worms - larve live in water flea until consumed by a human, then live in a human

Occur when individuals die or become immune ex. Scottish bird

number of individuals infected by an individual for a disease to disappear, R<1

Number of individuals infected by an individual in a naïve population

R0-1/R0

ability for a pathogen to cause its host damage depends on multiple factors, with transmissibility as the primary factor most virulent diseases are ones that have just entered the population

when a pathogen is transmitted from one host to the next ex. cold less likely to kill or harm the host since that would not favor the spreading of the pathogen

More likely to kill and harm ex. malaria parasite uses another mechanisms to transfer to other hosts, debilitating hosts to reproduce

Immunity: will not catch the disease Tolerance: not impacted by the disease, but can still carry it

Diseases that passed form one species to another

Type of spillover Diseases spread form animal to human

Zoonoses from the past 30 years