Which of the following is a common method of transmission for schistosomes?

Schistosomes, which are parasitic worms responsible for schistosomiasis, commonly spread through exposure to contaminated water. This occurs when people come into contact with freshwater bodies—such as lakes, rivers, or irrigation ditches—where the larvae of the schistosome, known as cercariae, are released by infected freshwater snails. Humans can become infected when these larvae penetrate the skin during activities such as swimming, bathing, or washing in these waters.

Other transmission methods suggested are less relevant for schistosomiasis. Direct contact with infected individuals does not spread schistosomes since they require a specific host interaction with freshwater snails. Ingestion of contaminated food is not a common transmission route for schistosomiasis; the parasites are not typically transmitted through this means. Airborne transmission is also not applicable, as schistosomes do not spread through the air. Thus, the most recognized and important method of transmission for schistosomes is through exposure to contaminated water sources.