Kala Azar

Kala Azar, also known as visceral leishmaniasis, is a chronic endemic infectious disease caused by Leishmania donovani. It used to be popular in the north of the Yangtze River. The source of infection is patients and sick dogs (mangy dogs), which are transmitted by sandflies. From May to August every year is the activity season of sandflies. When sandflies suck the blood of patients, protozoa enter the sandflies and develop into flagellates. Seven days later, when sandflies bite the human body again, they inject flagellates to cause infection. Protozoa mainly parasitize in the patient's blood, liver, spleen, bone marrow and lymph nodes.