The effect of Trypanosoma evansi in determination of blood grouping

Although T.evansi can infect most domestic animals it is a primarily a parasite of camels and horses. However T.evansi infection of a man in India was the first report of its kind. In attempt to explain this unusual event (Joshi et al.2005) suggested that as animal trypanosomes are sensitive to human plasma components and that they will die when introduced into blood stream of human. In this case of T.evansi infection in a man therefore trypanosome had evidently developed the ability to resist this lytic activity which may have occurred either between the parasite mutated to a form that can resist the lytic factor in the human plasma or that the human host had a deficiency in the lytic factor in the plasma. Howeversurveys in India showed that this was not the only case.