Simplified membrane feeding of bloodsucking triatomines (Hemiptera: Reduviidae).

Laboratory-reared hematophagous triatomines that are the main vectors of Chagas disease are generally fed on small vertebrates or on blood-filled membrane devices. Such devices allow a large-scale rearing of these vectors without sacrificing host animals but are almost always expensive, fragile, not easily purchased, and usually difficult to use because they need to be sterilized before and carefully cleaned after each feeding. We present here a simple device to feed triatomines that is composed of a circular series of alternating short pieces of stainless steel and silicon tubing connected to a pump that circulates water heated at 50° C in a water bath. An unlubricated condom filled with 50ml of blood, is fixed around each steel tube section and placed onto the screened tops of containers with triatomines. Nymphs and adults access the blood source by climbing a vertical piece of folded filter paper. After feeding, each condom can be easily and safely removed and discarded. This device consists of simple, cheap, safe and robust components that can be easily purchased, assembled and used. Contamination during or after feeding is practically excluded. The technique is successfully used in our Laboratory for almost two years.