Parasitic diseases are caused by microscopic organisms, such as protozoa and helminths, that live off of other living organisms, such as humans, animals, and plants. These parasites can be spread through direct contact with an infected person or animal, or contact with contaminated food or water.
The most common way for parasitic diseases to spread is through contact with feces or body fluids of an infected person or animal. For example, Giardia, a type of protozoan parasite, is spread through contact with contaminated food, water, or surfaces. The parasite can also spread through contact with an infected person’s feces or contaminated objects, such as diapers, toys, or bedding.
Infected animals can also spread parasites to humans. For instance, toxoplasmosis, a type of protozoan infection, is spread through contact with the feces of an infected cat. Additionally, parasites can spread from person to person through blood transfusions or the sharing of needles.
Mosquitoes are also a common carrier of parasitic diseases. For example, malaria, a type of protozoan infection, is spread through the bite of an infected mosquito.
Finally, some parasites can be spread through sexual contact. For example, trichomoniasis, a type of protozoan infection, is spread through contact with an infected person’s genitals, rectum, or mouth.
Overall, parasitic diseases can spread through direct contact with an infected person or animal, contact with contaminated food or water, contact with contaminated objects, the bite of an infected mosquito, or through sexual contact.