Warning: can cause large drop in blood sugar level. Can be caused by Echovirus 4, Coxsackie B1 and B4 virus and Human Parechovirus infection.Encyclopedia Entry for Diabetes 1 :Diabetes 1. Can be caused by Echovirus 4, Coxsackie B1 and B4 virus and Human Parechovirus infection.Information from Marcello Allegretti.