B74.4

Clinical Causes: Infection occurs when a person is bitten by a female mosquito or other biting insects infected with Mansonella microfilariae. Transmission mainly involves specific mosquito species found in endemic regions, such as areas in Central and South America, Africa, and parts of Asia. Once bitten, the larvae enter the human skin through the wound caused by the insect bite. The larvae develop into adult worms in the body, primarily inhabiting the subcutaneous tissue or body cavities. Repeated exposure to infected insect bites increases the risk of contracting Mansonelliasis.

Key Symptoms: Many individuals with Mansonelliasis experience no noticeable symptoms; the infection can be asymptomatic. Some may develop mild symptoms including: - Itchy skin rashes or dermatitis - Swelling or edema, especially in the limbs or genitals - Mild fever or malaise - Fatigue or general weakness - Skin nodules caused by the presence of adult worms In certain cases, persistent or high microfilarial loads might lead to more noticeable health issues, like sleep disturbances or low-grade inflammation.

Diagnosis Path: Diagnosis often involves microscopic identification of microfilariae in blood samples taken at specific times, as microfilariae exhibit periodicity. Blood smears are typically examined under a microscope to detect microfilariae during their peak circulation periods. Serological tests and molecular techniques, such as PCR, may be used for confirmation, especially in ambiguous cases. Imaging might help identify adult worms in tissues or body cavities if symptomatic.

Treatment Protocols: Management of Mansonelliasis generally involves antiparasitic medications such as: - Diethylcarbamazine (DEC), which targets microfilariae and immature worms - Ivermectin, used in some cases to reduce microfilarial loads Treatment aims to eliminate microfilariae and prevent complications, although adult worms can persist. Additional supportive care may include managing symptoms like skin rashes or swelling. In endemic areas, public health measures such as vector control and personal protective strategies are important in reducing transmission.