Why would you want to understand incidence of a disease?
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- Figuring out the etiology of a disease (ability to directly estimate risk) and
looking at acute diseases of short duration.
- Usually more expensive and time- consuming to study
An immunochromatographic test for fecal canine parvoviruses (CPV)
antigen is being tested in 22 zoos to investigate whether some of the
large cats (lions, tigers, leopards) may have a panleukopenia-like
syndrome secondary to canine parvo infection.
Here are test results, compared to a gold standard test for CPV. What
is the predictive value negative (PVN) of the new parvo test?
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, 819/841 = 97%
On June 1, 2016, 56 cats in a humane society shelter in Memphis, Tennessee, were
screened for feline leukemia virus (FeLV) with an antigen test on plasma. Is the
following measurement incidence or prevalence?
100*((# of cats positive for FeLV)/(# of cats in the shelter))
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prevalence
The following are examples of what kind of error?
• Problem with test methodology
• Instrument error or failure
• Interfering substance within sample - Hemolysis
- Lipemia - Icterus (increased bilirubin)
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analytical
What are common types of epidemiology related questions on the NAVLE?
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Give this one a try later!
- Figuring out the etiology of a disease (ability to directly estimate risk) and
looking at acute diseases of short duration.
- Usually more expensive and time- consuming to study
An immunochromatographic test for fecal canine parvoviruses (CPV)
antigen is being tested in 22 zoos to investigate whether some of the
large cats (lions, tigers, leopards) may have a panleukopenia-like
syndrome secondary to canine parvo infection.
Here are test results, compared to a gold standard test for CPV. What
is the predictive value negative (PVN) of the new parvo test?
Give this one a try later!
, 819/841 = 97%
On June 1, 2016, 56 cats in a humane society shelter in Memphis, Tennessee, were
screened for feline leukemia virus (FeLV) with an antigen test on plasma. Is the
following measurement incidence or prevalence?
100*((# of cats positive for FeLV)/(# of cats in the shelter))
Give this one a try later!
prevalence
The following are examples of what kind of error?
• Problem with test methodology
• Instrument error or failure
• Interfering substance within sample - Hemolysis
- Lipemia - Icterus (increased bilirubin)
Give this one a try later!
analytical
What are common types of epidemiology related questions on the NAVLE?
Give this one a try later!
