<s>[INST] My son had vaccinations done 4 weeks ago and then did blood work 2 weeks ago. It showed he had a low white count of 3.1 and high eosinophil count of 8. Normal ranges on eos is 0-4. Provider reccomendations was to repeat cbc in 2 weeks. CBC shows today 3.4 wbc and eos went up to 9. My son is 12 and shows no symptoms of allergies or diarhea. Could this be from vaccinations? [/INST] Hello, Thnx to contact us. If I am your treating doctor I would like to advice you that vaccination does not cause rise in eosinophil count. Common cause of eosinophilia include allergy and parasitic infection. Try to find out this two causes from your son. There are other rare causes of eosionphilia also there but they are very rare this include: polyarteritis nodosa, Churg-Strauss syndromeAddison's disease, skin disease - pemphigus, urticaria, eczema, dermatitis herpetiformis, erythema multiforme; Loeffler's syndrome, Loeffler's endocarditis, scarlet fever, irradiation, during convalescence from any infection, hypereosinophilic syndrome, post-splenectomy, cholesterol emboli syndrome, drugs - penicillins, streptomycin. If you have anything else to ask please contact me. Thanx. Dr. Arun Tank </s>