After the 2014-2015 Ebola outbreak, viruses causing hemorrhagic fever have garnered increasing international attention. Infection with Lassa virus is an important cause of fever in children in West Africa. Exact figures are unknown, but a study showed 6% of febrile admissions in Nigeria were due to Lassa fever.1 Considering ever-increasing global migration, pediatricians should be aware of Lassa virus risk factors and treatment standards. The diagnosis should be considered by pediatricians in the United States treating children newly arrived from endemic areas, as Lassa virus may be an underrecognized source of infection in this population.