Eosinophils are predominantly associated with which type of health issue?

Eosinophils are a type of white blood cell that play a crucial role in the immune response, particularly in dealing with parasites and allergic reactions. Their primary function is to combat multicellular organisms, such as helminths (worms) and other larger parasites, which are too big for other immune cells to engulf and destroy. Eosinophils release cytotoxic granules containing enzymes that are effective against these parasites.

In addition to their role in parasitic infections, eosinophils are also significantly involved in allergic responses. Conditions such as asthma, hay fever, and allergic rhinitis lead to an increase in eosinophil counts as the body reacts to allergens. This response is part of the immune system's strategy to mitigate what it perceives as harmful substances, leading to inflammation and other symptoms associated with allergies.

While eosinophils can be present in other health issues, their predominant association is with parasitic infections and allergic conditions. The roles played by eosinophils in the immune response highlight their importance in these specific health contexts.