Answer:
B
Explanation:
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They usually appear and disappear seasonally. Therefore option C is correct.
Epidemic diseases often exhibit seasonal patterns, meaning they tend to have higher incidences during specific times of the year.
Factors such as weather conditions, human behavior, and the life cycles of disease-causing agents contribute to this seasonality.
For example, the flu tends to peak during the winter months, while diseases like malaria may increase during the rainy season when mosquito populations thrive.
Understanding these seasonal patterns is crucial for public health planning and resource allocation to combat outbreaks effectively.
While some epidemics can have abrupt endings, it's more common for epidemic diseases to gradually decline in incidence and become endemic, with periodic outbreaks occurring seasonally or in irregular intervals.
Therefore option C They usually appear and disappear seasonally is correct.
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