Disease Detectives B/C

[hmath729]

Welcome to Disease Detectives B/C 2015! I'll start the questions...
What is the difference between cohort and case-control studies?

[Fyren]

answer (Click to Show Hidden Text)

For a case-control study, participants are selected on a basis of [i]whether or not they have the disease[/i]; then, they are compared for common exposures to determine if an association exists. For a cohort study, participants are selected on a basis of [i]exposure or no exposure[/i]; then, disease occurrence is compared to determine if an association exists. Choosing a study type depends on what you already know. If there are 3 students who at school lunch last week and 100 cases of salmonella are reported, a case-control would be best because for those 100 cases, you can determine exposure to school lunch (Y/N) and look for an association.

Give two examples of each: 1) vectors, 2) fomites, 3) zoonotic diseases.

[hmath729]

Yep, your turn!

[Fyren]

Give two examples of each: 1) vectors, 2) fomites, 3) zoonotic diseases.

[hmath729]

Vectors (Click to Show Hidden Text)

ticks, mosquitoes

Fomites (Click to Show Hidden Text)

Comb, headphones

Zoonotic Diseases (Click to Show Hidden Text)

Lyme disease, salmonellosis

[Fyren]

Correct, your turn!

[hmath729]

(I can't think of anything else right now...)
Bob shared his headphones with Joe. Bob then used them again. The next day, Bob was diagnosed with head lice. The headphones are an example of...

[bernard]

Answer (Click to Show Hidden Text)

A fomite!

[hmath729]

Correct, your turn.
Sorry it took me so long to reply, I was inactive.

[bernard]

Define risk difference. Risk difference is the difference in rates of occurrence between exposed and unexposed groups in the population.