What is the hygiene hypothesis?
A. People who have more exposure to infectious agents will have an overactive immune system.
B. People who have less exposure to infectious agents will have an overactive immune system.
C. People who have better hygiene and are cleaner will have a weaker immune system.
D. People who have better hygiene and are cleaner will have more infections.
E. People who have better hygiene and are cleaner will have fewer infections.
B. People who have less exposure to infectious agents will have an overactive immune system.
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If the phage types of isolates are identical, and a connection exists between the isolates, the chances are great that they are epidemiologically related.
A) True B) False
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A. bedrock B. soil base C. subsoil D. topsoil
True of False: Escherichia coli is positive for motility.
What will be an ideal response?