Reservoir host is referred to those animal hosts of human parasites, in which parasite are kept alive for long period of time with frequent excretion of the eggs or pathogens. Therefore reservoir hosts are potential source of infections in human being. Example: a buffalo, the definitive host of schistosoma japonicum, harbor the parasite that can be transmitted to humans▪Reservoir host is referred to those animal hosts of human parasites, in which parasite are kept alive for long period of time with frequent excretion of the eggs or pathogens. Therefore reservoir hosts are potential source of infectionsin human being. Example: a buffalo, the definitive host of Schistosoma japonicum, harbor the parasite that can be transmitted to humans