Definition
The term "genus Leishmania" refers to a group of parasitic protozoa that cause the disease leishmaniasis. These parasites are transmitted to humans and animals through the bite of infected sandflies. Leishmania parasites exist in two main forms: promastigotes (found in the sandfly) and amastigotes (found in the mammalian host). Leishmaniasis can manifest in different forms, including cutaneous (skin sores), visceral (affecting internal organs), and mucocutaneous (affecting mucous membranes). Diagnosis involves identifying the parasite in tissue samples or through serological tests. Treatment options vary depending on the type and severity of the infection, often involving antiparasitic drugs. Think of it as a microscopic invader causing big problems.