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REHS EPH Program Week Five Practice Test

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Which disease is carried by rats?
Correct Answer:
Leptospirosis
Explanation:
Rats are a well-known reservoir for leptospirosis, a bacterial infection caused by Leptospira species. Transmission usually happens when skin or mucous membranes contact water or soil contaminated with rat urine, often after flooding or in sewage-adjacent environments. The disease can cause fever, headache, and body aches, and may progress to more serious organ involvement if not treated. This makes leptospirosis the best choice for a disease carried by rats because the risk comes from environmental contamination stemming from the rat reservoir, not from insects or direct human-to-human transmission. Malaria is spread by Anopheles mosquitoes, not rats. Lyme disease is transmitted by Ixodes ticks. Tuberculosis spreads primarily through airborne droplets between people.

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