Parasites

Parasites are organisms that live on or in a host organism and obtain nutrients at the host's expense. They can cause various medical conditions ranging from mild symptoms to severe disease and even death. Medically, parasites are classified into three main categories: ectoparasites, which live on the surface of the host (e.g., lice, ticks); endoparasites, which live inside the host's body (e.g., tapeworms, Giardia); and mesoparasites, which enter the host's body intermittently (e.g., some types of flukes). These biological invaders can enter the human body through various means such as contaminated food or water, insect bites, or direct contact with an infected person or animal.

The impact of parasitic infections on human health can be significant. Parasitic diseases, like malaria caused by Plasmodium species, affect millions globally. Symptoms depend on the type of parasite and can include diarrhea, abdominal pain, weakness, and malnutrition. In some cases, parasitic infections lead to chronic health problems and can even be fatal if left untreated. Diagnosing parasitic infections often involves laboratory tests, and treatment options vary, often including specific anti-parasitic medications. Prevention strategies, such as sanitation, vector control, and education, are key to managing and reducing the burden of these infections worldwide.