When are basophils and eosinophils typically elevated?

Basophils and eosinophils are types of white blood cells that play significant roles in the immune response, particularly in allergic reactions and parasitic infections. Eosinophils are primarily involved in combating parasitic infections and also are key players in the inflammatory response associated with allergies, such as asthma, hay fever, and eczema. When the body encounters allergens or parasitic organisms, the levels of these cells increase in response to the stimuli, effectively aiding in the defense against these invaders.

Basophils, although present in lower numbers compared to other white blood cells, are also connected to allergic processes. They release histamine and other mediators that contribute to inflammation and allergic responses. The elevation of these cells is a typical finding in conditions where there is an immune response or hypersensitivity to certain substances.

In other circumstances such as viral infections or chronic bacterial infections, different types of white blood cells, namely lymphocytes and neutrophils, are usually more elevated. Therefore, the specific elevation of basophils and eosinophils aligns with allergic reactions and parasitic infections, making this the correct identification in the context of the question.