Multiple choice The number which one of the following increases during allergic diseases and leukaemia? Lymphocytes Basophils Eosinophils Neutrophils Reveal answer Fill a bubble to check yourself C Correct answer Explanation Eosinophilia is a condition in which the eosinophil count in the peripheral blood exceeds 4.5 × 108/L (450/μl). The most common causes are being some form of allergic reaction or parasitic infection.