What can infected, untreated individuals of schistosomiasis do?

Infected, untreated individuals of schistosomiasis can discharge schistosome eggs into freshwater, which is crucial for the life cycle of the schistosome parasites. When these eggs are expelled through the host's urine or feces, they eventually reach water bodies, where they hatch and enter an aquatic environment. This is significant because the larval forms of the parasites, known as cercariae, emerge from the eggs and can infect freshwater snails, continuing the transmission cycle to humans.

Understanding the transmission dynamics of schistosomiasis emphasizes the importance of managing water sources and sanitation, particularly in regions where the disease is endemic. The other options do not accurately represent the transmission pathways of schistosomiasis, as the disease is not spread through airborne droplets, contaminated soil, or direct contact in the ways described. Instead, it relies primarily on interactions with freshwater environments where the lifecycle thrives.