Which influenza type is primarily found in cattle and does not infect humans?

Which influenza type is primarily found in cattle and does not infect humans?

• A. Influenza A
• B. Influenza B
• C. Influenza C
• D. Influenza D

Answer: (D)

Host range and species specificity distinguish these influenza types. Influenza D is the one found primarily in cattle and is not known to cause infection in humans. It was identified as a distinct influenza type circulating mainly in bovine populations, with no established human disease. In contrast, influenza A affects humans (and many animals) and drives seasonal flu and pandemics; influenza B circulates mainly in humans (and some seals) with generally milder disease; influenza C can infect humans and pigs but usually causes very mild illness and isn’t a major human pathogen. So, the descriptor that links cattle to a lack of human infection points to influenza D as the correct type.

Host range and species specificity distinguish these influenza types. Influenza D is the one found primarily in cattle and is not known to cause infection in humans. It was identified as a distinct influenza type circulating mainly in bovine populations, with no established human disease. In contrast, influenza A affects humans (and many animals) and drives seasonal flu and pandemics; influenza B circulates mainly in humans (and some seals) with generally milder disease; influenza C can infect humans and pigs but usually causes very mild illness and isn’t a major human pathogen. So, the descriptor that links cattle to a lack of human infection points to influenza D as the correct type.