ase-control Slud host-to-host epidem mon source epidemic Concept Questions Consi

Question

ase-control Slud host-to-host epidem mon source epidemic Concept Questions Consider the following statistics for the number of Y - si of a particular infectious disease in a given geo graphic area. MONTH NO. OF CASES January February March April May June July August September October November December er IT 4 101 611 2404 900 313 48 Gl ch le thi yo He hit wo In which month is the proportion of immune individuals the highest? In which month would it be the lowest? Is 6. this proportion increasing or decreasing between lar February and May? Between May and September? tio Between October and December? Would you guess that me this is a common source epidemic or a host-to-host epi- demic? Explain your reasoning. tar

Explanation / Answer

Common source:

Common source epidemic will have sudden rise in number of cases presented with disease followed by a sudden drop.

Host-to-host:

Host-to-host epidemic will have slow rise in the number of cases presented with disease followed by a very slow drop, as indicated by the data in the table.

So the data in the table shows a Host-to-host epidemic.

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