Regarding eosinophilia in parasitic infections, which statement is most accurate?

• A. It is never observed
• B. It is commonly observed
• C. It is only in acute viral infections
• D. It occurs only with protozoa

Answer: (B)

Eosinophils rise as a typical response to parasitic infections, especially tissue-dwelling helminths. The immune system recruits eosinophils to attack parasites, releasing cytotoxic granules that damage the parasite’s surface and help regulate the inflammatory response. Because this eosinophilic response is common during parasitic infections, the finding of eosinilia is often observed in these cases. In contrast, viral infections and protozoal infections do not usually provoke such a pronounced eosinophil response, so the statement that eosinophilia is commonly observed best fits parasitic infections overall. Keep in mind that not every parasite infection will show eosinophilia, but it remains a common and characteristic feature.