Murine typhus is transmitted to humans by fleas infected with Rickettsia typhi. It is prevalent in which region?

Murine typhus is transmitted to humans by fleas infected with Rickettsia typhi. It is prevalent in which region?

• A. Northern Europe
• B. Southern U.S.
• C. Southeast Asia
• D. Sub-Saharan Africa

Answer: (B)

Murine typhus spreads through fleas (primarily the rat flea) that bite infected rats and then humans. This transmission thrives in warm, humid environments with abundant rat and flea populations. In the United States, such conditions are most consistently present in the southern states, including coastal and port areas where rats and fleas are common. So, among the regions listed, the southern U.S. is the region where murine typhus is most prevalent. Northern Europe’s cooler climate is less favorable for the flea–rat cycle, while Southeast Asia and Sub-Saharan Africa have cases but the pattern described points to the southern United States as the more typical prevalence region.

Murine typhus spreads through fleas (primarily the rat flea) that bite infected rats and then humans. This transmission thrives in warm, humid environments with abundant rat and flea populations. In the United States, such conditions are most consistently present in the southern states, including coastal and port areas where rats and fleas are common. So, among the regions listed, the southern U.S. is the region where murine typhus is most prevalent. Northern Europe’s cooler climate is less favorable for the flea–rat cycle, while Southeast Asia and Sub-Saharan Africa have cases but the pattern described points to the southern United States as the more typical prevalence region.