Drug resistant strains of all species of malaria becoming more common. Vaccine development is a major goal, but complicated to make since there are too many parts to the life cycle. Can't make an antigen that is common to all. Causes cryptosporodiosis Cryptosporidium is a tiny protozoan, an opportunist not a frank pathogen. Cryptosporidium gave diarrhea to 3 million people in Milwakee a few years ago.
Most drinking water is purified by a combination of filtration and chlorination.
This protozoan is so small that it is not easily filtered out and it is not killed by chlorine disinfectants. Tell the story of cyclospora and the wedding strawberries. Parasites in the Kingdom Animalia Helminths are parasitic worms in the animal kingdom. Humans and helminths both belong to the animal kingdom so our cells are not only both eucaryotic but are very similar. Drug therapy for helminth infections is difficult since selective toxicity is a problem.