Disease Detectives B/C Question Marathon

[hmath729]

Hello, there are so little disease detectives around.
Here's another question...
What is the odds ratio and where is it used?

[ayw]

Hello, there are so little disease detectives around.
Here's another question...
What is the odds ratio and where is it used?

my ans (Click to Show Hidden Text)

used in case control study to evaluate the possible agents and vehicles of transmission.
in the two by two table, it is ad/bc

[Fyren]

Hello, there are so little disease detectives around.
Here's another question...
What is the odds ratio and where is it used?

my answer (Click to Show Hidden Text)

Odds Ratio is used to estabilish the presense of a cause by measuring the association between exposure and outcome.  They are typically used in case-control studies, as that type of study investigates exposure and outcomes.  Its calculation considers those where exposure is a factor and where exposure is not a factor.

[hmath729]

Correct, your turn!!!

[hmath729]

how do you hide answers?

[phil9047]

how do you hide answers?

u click [hide] [/hide] and in the middle, you type the words you want to show and then | and then words you want to hide.
It would look like [hide] words to show|words to hide [\hide]

*note the slash is backwards because its not supposed to hide

[Fyren]

Correct, your turn!!!

Here's a longer question that matches the types I've seen at tournaments:

On September 7, 1997, a brief report in the press described a problem of disease among fish and illness among watermen (commercial fishermen) working along the Eastern Shore of the Chesapeake Bay. The report cited the case of an experienced fisherman who after two days working on the Potomac River was ill with nausea, vomiting, and stomach cramps. Other workers reported small, itchy, red, circular skin rashes, memory loss, and respiratory tract problems. Fish, reported to have bloody sores, died by the thousands. The fisherman mentioned above said he found sores on as much as 90% of his catch. Maryland officials say that because of publicity, the loss in retail fish sales could be as high as $20 million.

Some scientists attributed the human symptoms to contact with toxin released by a microorganism called Pfiesteria piscicida, which was first identified in the early 1990s, but is thought to have existed for centuries. Some researchers believe this one-celled organism normally exists in a non-toxic form and that animal waste and fertilizers from farms discharged into waterways helped the Pfiesteria to multiply. Concerns about the problem caused the states of Maryland and Virginia to prohibit activities such as swimming, boating, and fishing in a seven-mile stretch of the affected area. In North Carolina, where problems linked to Pfiesteria have recurred for years, officials planned to carry out studies similar to those in Maryland.

Develop and specify probable hypotheses to explain the cause, source, and spread of the outbreak.

[hmath729]

Sorry... ?????? Don't know.

[Fyren]

Sorry... ?????? Don't know.

the answer i was looking for (Click to Show Hidden Text)

HYPOTHESES EXPLAINING CAUSE, SOURCE, AND SPREAD:
The microorganism secretes a toxin that affects fish, and the fish, in turn, affect the watermen. 
An as-yet-unidentified toxin(s) (perhaps of industrial origin) in the river is causing disease in the fish and/or in watermen. 
The watermen were exposed through some other workplace-related source of toxin. 
This is a community outbreak unrelated to the fish. Many people in the surrounding area are involved, but to date only the watermen have been identified.

[hmath729]

Can I ask now?