In order to do so we first need to document and map the presence of the snails that host trematodes in Lake Kariba. This mapping allows us to identify possible transmission hotspots in the area. Snail species are identified using morphological and molecular techniques. They are subsequently tested for infection through microscopic analyses of live snails in the field laboratory. Snails shed parasite larvae (called cercariae) when the infections are mature (patent). Since this technique is labour-intensive and not sufficiently sensitive, we want to develop sensitive molecular techniques to rapidly and reliably identify prepatent parasite infections in freshwater snails. Monitoring snail and parasite prevalence over time will allow us to determine exposure risk. Additionally, this will help understand the factors that drive snailborne diseases, and ultimately help us to control them in the future.
Join MSc student Hans Carolus as he takes us to the largest artificial lake in the world, Lake Kariba in Zimbabwe. He shows us how he collects snail samples together with student Kudzai Muzarabani from the University of Zimbabwe, and how he analyses them in the molecular laboratory of the AfricaMuseum. (c) Hans Carolus
What did we find?