Hymenolepis nana (Dwarf Tapeworm) Infection By Chelsea Marie, PhD, University of Virginia; William A Petri, Jr, MD, PhD, University of Virginia School of Medicine Reviewed / Revised Dec 2021 | Modified Sep 2022 View Patient Education Treatment Hymenolepis nana, a tiny intestinal tapeworm, is one of the most common human cestodes; the life cycle does not require an intermediate host.