Which environmental factors are likely to affect the life cycle of disease pathogens and their vectors and thus disease outbreaks? (Select all that apply.)
A) Temperature
B) Geology
C) Precipitation
D) Humidity
E) Amount of daylight
Ans: A, C, D
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Many infectious diseases have characteristic geographic distributions and seasonal variations. Probably the most common is the influenza virus, which peaks each fall and winter. Factors such as temperature, precipitation, and humidity affect the life cycle of many disease pathogens and their vectors, and consequently they can affect disease outbreaks. Geology, or the types of rocks present in the area, and the amount of daylight are not likely to affect the life cycle of disease pathogens and their vectors.
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