"Ribavirin for Chronic Hepatitis E Virus Infection in Transplant Recipients"
NEJM
http://www.nejm.org/doi/full/10.1056/NEJMoa1215246 
"CONCLUSIONS

This retrospective, multicenter study showed that ribavirin as monotherapy may be effective in the treatment of chronic HEV infection; a 3-month course seemed to be an appropriate duration of therapy for most patients."