Which leukocyte primarily attacks parasitic infections?

Eosinophils play a crucial role in the body's defense against parasitic infections. These white blood cells are characterized by their ability to respond specifically to larger parasites like helminths (worms) that are too big for phagocytosis. When a parasitic infection occurs, eosinophils are recruited to the site of infection where they release cytotoxic granules containing proteins such as major basic protein and eosinophil peroxidase. These substances are effective in damaging the parasite's cell membrane, leading to the destruction of the pathogen.

In addition to their role in combating parasitic infections, eosinophils are also involved in allergic reactions and asthma. Their numbers can increase significantly during these types of responses, but their primary function remains in the immune defense against larger parasites, distinguishing them from other types of leukocytes such as neutrophils, monocytes, or basophils, which have different roles in the immune response.