Many causes: Elevated eosinophils and fever can be caused by allergies, a drug reaction or certain infections - but these are rare in the US. EG. coccidioidomycosis (valley fever) is found in the southwestern US, Trichinella (roundworms from uncooked meat), hookworms, Paragonomiasis, and toxocara (visceral larva migrans, from infected animal litter).
Answered 3/25/2022
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