<i>Toxocara</i> -induced eosinophilic myocarditis

Eosinophilic myocarditis is a rare inflammatory heart disease with a variety of etiologies and prevalence that varies geographically. The present case involves a 39-year-old patient from rural Arkansas with biopsy-proven eosinophilic myocarditis. He presented in acute decompensated heart failure with positive serology for <i>Toxocara</i> along with brisk myocardial infiltration of eosinophils and neutrophils. This case demonstrates the importance of history taking, the diagnostic complexity, and the wide variety of potential causes of eosinophilic heart disease, including from host response to infectious diseases.