Ascaris spp. primarily infects humans through which source?

Ascaris spp., which includes Ascaris lumbricoides, is primarily transmitted to humans through the ingestion of contaminated vegetables. This occurs mainly when these vegetables are fertilized with human feces containing the eggs of the parasite. If vegetables are not thoroughly washed or cooked, the eggs can remain viable and infect a person upon consumption.

Contaminated water can also be a source of infection, as Ascaris eggs can be present in water that has been contaminated with human waste; however, the primary transmission route is through contaminated food sources, particularly vegetables, since these are frequently consumed without proper cooking.

While raw dairy products and infected seafood can carry other types of pathogens or parasites, their association with Ascaris spp. specifically is not established, making them less relevant in this context. Thus, the emphasis on contaminated vegetables as the primary source of infection highlights the importance of proper agricultural practices and food safety measures to prevent the transmission of Ascaris infections.