Cavally virus and Nam Dinh virus have been identified as two serotypes of the same species, Alphamesonivirus 1, and placed in a newly discovered family—Mesoniviridae.
Posteriormente, o virus Cavally e o Nam Dinh identificáronse como dous serotipos da mesma especie, Alphamesonivirus 1, e finalmente foron situados nunha nova familia, a Mesoniviridae.