Bacterial Pathogenis Flashcards
(26 cards)
Virulence
Measure of disease causing ability
Avirulent: does not cause disease
Virulent: bacterial strain with disease causing ability
Pathogenicity
The mechanism of how a MO causes infection
Parasitism
One microbe diaries benefit from the other
Reservoir
Source of MO
The MOs home
Contagious
Communicable
Infection
Successful invasion of body
Infectious
Means capable of invading the body
Symbiosis
Living together
Mutualism: both benefit
Commensalism: one benefits, other unharmed
Parasitism: one benefit, one harmed
Morbidity
Incidence of disease
Mortality
Incidence of death
Virulence factors
Pathogens trait to cause disease
What is needed for host parasite relationships?
- Maintain a reservoir
- Leave the host and create a new infection
- Colonization of host
- Damage host to get nutrients
Syndrome
A group of symptoms
Asymtomatic: with out symptoms
5 stages of diseas
Incubation time between infection and first symptoms
Prodromal: short period of malaise
Illness: most sever stage
Decline: body returns to normal
Convalescence: more recovery from secondary affects
Nosocomial
An infection accursed in hospital or clinic
Exogenous: acquired ar healthcare setting
Endogenous: normal flora becomes opertuneistic
Superinfection like MSRA
Incidence
Number of new cases
Prevelance
Total number of cases
Sporadic
Scatter cases
Epidemic
Greater frequency than normal
Endemic
Stable incidence within population
Pandemic
Epidemic on two or more continents
3 types of resivoir
- Environment (soil, air, fo mite, water, food)
- Zoonotic( from an animal vector)
- Human body
Portal of entry
Gets into body
Right place at right time
Portal can determine disease outcome
Example anthrax
Mode of transmision
Direct
Host to host
- Vertical or placental
- Horizontal STD
- Self infect UTI
- Mechanical vector on the outside of bug
- Biological vector part of life cycle
