The Memórias do Instituto Oswaldo Cruz is a multidisciplinary journal which publishes original research throughout the fields of tropical medicine (including pathology, field epidemiology and clinical studies) medical parasitology (including protozoology, helminthology, entomology and malacology), and medical microbiology (virology, bacteriology and mycology). It particularly welcomes basic and applied research in biochemistry, immunology, molecular and cell biology, physiology, pharmacology and genetics related to these fields. Short communications are also considered. Review articles are invited. The journal publishes twelve issues constituting one volume per year. Occasionally papers presented at symposia or congresses are published as supplements.