Infectra-kit: A device for restraining mice and confining tsetse flies during trypanosome infection transmission experiments

Abstract

Chemical(anaesthesia) and manual techniques are commonly used to restrain mice during vector mediated parasite transmission experiments in laboratory. Chemical restrain may interfere with natural fly vector-mouse interactions and therfore potentially affect the outcome of transmission experiments. Conversely, manual restraint is labour-intensive and exposes laboratory animals to excessive restraining- related discomfort. We report development of a mouse restraining device (infectra-kit)that allows essential transmission studies to be carried out with animal human manipilation and without the need for anaesthesia. Infectra- kit can be used as a single unit for restraining one mouse or as eight- assmbled units, thus significantly improving effeciency of a single operator in comparision to manual restraint. The kit was validated by comparing feeding success in tsetse flies fed on mice restrained usning infectra-kit(group 1 )to those manually restrained (group II). The mean +SE% feeding sucess was 75.0+8.2% for tsestse flies in Groups I and II respectively. Statistical analysis using two sample, test showed no significant difference between the two groups at p< 0.05, indicating that infectra -kit as restraining device was as good as the conventional manual restraint method. The main benefits of using infectra-kit for transmission studies therfore include reduction of man- hours and animal restrainining-related discomfort, which is an important consideration when working with zoonotic parasites.