invite friends ⋅ share via emailtwitter
support the site ⋅ become a member ⋅ unscramble the egg
free120  nbme24  nbme23  nbme22  nbme21  nbme20  nbme19  nbme18  nbme17  nbme16  nbme15  nbme13 

NBME 16 Answers

nbme16/Block 1/Question#18 (4.9 difficulty score)
A screening program is instituted for ...

Login to comment/vote.

 +1  upvote downvote
submitted by aoa05(11),

The calculation for incidence is the number of new cases divided by the population risk. Remember in this question you were told that 500 of the 2500 have already tested positive for the disease. Now, you will have only 2000 at risk for the next year. Therefore, the annual incidence would be number of new cases divided by the population at risk which is  200/2000= 10%.

mm9283  Is this not a silly question? It's assuming that those 500 individuals cannot get chalmydia again next year, but there is no reason they are still not at risk! It's not like they become immune to it +