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Schistosoma is a type of parasitic worm which can be found in freshwater in certain parts of the world such as Africa, Asia, South America, and the Caribbean. Often referred to as 'schistosomiasis' or 'snail fever', the infection caused by these worms can have a negative impact on the health of those affected. However, there are also positive benefits associated with schistosoma which should not be overlooked.

Firstly, schistosoma worms can have an important role in controlling the population of mosquitoes. The larvae of the worms feed on mosquito larvae, reducing their ability to reproduce. This can be beneficial for the humans living in the area, as it reduces the risk of mosquito-borne diseases such as malaria, dengue fever, and Zika virus.

Furthermore, infections caused by schistosoma worms have been linked to a decrease in the prevalence of other more serious infections caused by other forms of parasite. Research has shown that schistosomiasis can reduce the chance of contracting certain serious diseases caused by parasites such as hookworm, liver flukes, and ascarids.

Finally, schistosomiasis can also provide a protective immune response in those infected. Studies have shown that those infected with schistosomiasis have a greater resistance to other infectious diseases such as malaria, compared to those who have not been exposed to schistosoma. This has led to the hypothesis that schistosomiasis can act as a protective immune response to other diseases, which can be helpful in controlling their spread.

In conclusion, although most of the discussion around schistosoma focuses on its negative impacts, it is important to remember that it can also provide some positive benefits. From controlling mosquito populations and reducing the prevalence of other serious diseases caused by parasites, to providing individuals with a protective immune response, the positive effects of schistosoma should not be underestimated.