Which type of white blood cell is primarily responsible for destroying allergens and fighting parasitic infections?

Eosinophils are a type of white blood cell that play a crucial role in the body's immune response, particularly when it comes to combating allergens and parasitic infections. They are characterized by their ability to release cytotoxic granules that contain proteins and enzymes, which are effective in breaking down the membranes of parasites. This makes them especially important in fighting larger organisms like helminths (worms) that cannot be engulfed by phagocytosis.

Additionally, eosinophils are involved in the inflammatory response associated with allergic reactions. They help modulate the immune response and can influence other immune cells, contributing to the overall response to allergens such as pollen or certain foods.

In contrast, neutrophils primarily target bacterial infections and are the first responders to sites of inflammation. Basophils are involved in allergic responses and inflammation but do not have the same parasitic defense role as eosinophils. B lymphocytes are primarily responsible for the humoral immune response, producing antibodies to neutralize pathogens rather than directly attacking parasites or allergens.