week 6 communicable diseases Flashcards
what is involved in the communicable diseas triad?
host - intrinsic, behaviours
agent - pahogenicity, infectiounsess, virulence, immunology, drug resistance
environment - pyshical, socials
what is the defintion of pathogegen?
organisim/agent capable of causing disease
what is the definition of pathogenesis?
mechanism by which pathgens produces disease
what is the defintion of virulence?
degree of pathogenicity - power of the pathogen
what is the defintion of suseptability?
abbility to contraction infection
what is the definition of resivour?
habitate where a pathogen normally lives, grows or multipples
what is the definition of carrier?
an asymptomatic perosn/animal that harbours a pathogen and serves as potential infection siurce
what is the definition of a vector?
living organism that plays a role in the transmission of pathogen to susceptible host
what is the definition of zoonosis?
infectious diseas transmitted from vertbrate animals to huams
what are the modes of infection?
skin to skin sexual contact blood born direct respitroy droplet transplant verticle - mother to foetus
what is an interect mode of transmission in relation to spread of disease?
transmission of a pathogen to a suseptable host bia the aid of a vectro, vehicle or air
what is the reproductive ratio?
avrage number of infections resulting from an infectiouse cause ie number f sucessful transmissions
what is the sum of the reproductive ration?
contact rate with susceptible people time probability of transmission per contact times infectious period
what is the chain of transmission?
pathogen resivoriour portal of exit from resivour tranmssion of pathogen portal of entry to host suseptible host pathogeneisis
