
Concept explainers
To determine:
The reason for the dramatic increase in the number of salmonellosis cases in the summer, while they are lower during the rest of the year, as observed by epidemiologists.
Case summary:
The strain of S. enterica that causes salmonellosis is spread through animal waste when it contaminates an individual’s food. Since salmonellosis resembles dysentery, it wasn’t a known disease some decades ago when diagnosis was primitive. Therefore, very old salmonellosis cases are not known. The treatment for this disease involves fluid replacement.
To determine:
The reason why the number of cases of typhoid fever caused by the same bacterium remains same perennially, as observed by epidemiologists.
Case summary:
S. enteric serotype Typhi that causes Typhoid fever is spread through human waste when it contaminates an individual’s food. It disease shows negligible symptoms, and can be treated with antimicrobial drugs.

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Chapter 20 Solutions
Microbiology With Diseases By Taxonomy (6th Edition)
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