Exam 1 Flashcards
What percentage of disease are zoonotic?
more than half 61%
What percent of emerging dz are zoonotic?
75%
What is the difference between clinician approach and epidemiologist approach?
Epidemiologists reduce dz without knowing etiology. (population, field, control/prevention, identify pattern, what is it)
Clinician- sick animal, hospital, Rx individual, identify dz, what is it, how to treat
Direct transmission is
types?
directly from reservoir to susceptible host
direct contact: skin to skin, bite. scratch
direct projection: direct projection: droplet spread, short range aerosols, coughing/talking
Biological vector
agent undergoes changes or multiples while in the vector, required for transmission
arthropod parasite to human
Propagated source curve
exposure followed by waves of secondary/tertiary cases
contagious dz
Common source single point exposure curve
all animals exposed at once & to the same source of infection.
NOT contagious
determine the min, average, & max incubation time
Secondary determinant
factors that make the dz more or less likely; predisposing or enabling factors
Intrinsic determinant
internal to the animal
Horse w/ upright conformation of hooves is predisposed to navicular dz
secondary intrinsic
Emerging disease
previously unknown dz that suddenly appears in a population or a known dz that suddenly appears in a new population
ex. outbreak of dz in a new species
Stage 2 of pathogen emergence
dead end host
animal reservoir transmits to human/other animals, but no transmission among them
Drivers of emerging dz
land use changes food & ag systems environmental systems human behavior transmission from intentional release
Food animal issues
carcass disposal from mass casualties, animal ID, policy issues, environmental contamination
(herd health good for disaster management)
Incident command system (ICS)
multiple agency cooperation
standardized, on scene, all hazard, incident management
flexible
Hazard is high & outrage is low
task of risk communication = precaution advocacy
alerting people to serious risk
emerging dz, 80% fatal, no one seems to care = precaution advocacy
In a pre-crisis it is important to
test messages, be prepared, foster alliances
Regulatory framework of USDA
is to provide surveillance for reportable dz
designates list of OIE-reportable dz not notifiable in USA
Suspected FAD
positive reports must be confirmed by USDA lab
Clinical vets need to know
signs of FAD’s, signs of reportable dz, proper procedures for vx & testing, how to fill out legal forms, who to report dz to
Who can preform exams for health certificates and perform activities related to regulatory dz
accredited veterinarians through USDA
Category II accreditation
all animals, no exclusions
pigs
Category I accreditation
excludes food & fiber species, horses, all birds, farm raised aquatic species & zoo animals that could transmit dz to livestock
Purpose of surveillance
rapid detection of dz outbreaks support dz control/ eradication assess population health & safety of food produce info about dz evaluate dz control/biosecurity programs
Passive surveillance
spontaneous report of cases or suspicion of a dz
ex. state surveillance of rabies, states depend on submission of case forms
pros: continuous, emerging dz, inexpensive
Active surveillance
representative of the population
Sentinel surveilance
small group is monitored as an indicator of the greater population health or dz risk
ex. chickens being bit by mosquitoes to tell us about EEV/WEEV
Primary prevention
prevent dz from occurring by keeping pathogens out
before the dz even occurs
ex. border security to keep out FAD from US, vx, meat inspection
Reducing contact potential
quarantine of possible infected