Lymphatic pathology in Wuchereria bancrofti microfilaraemic infections

Area of Science:

• Tropical medicine
• Medical imaging
• Parasitology

Background:

• Wuchereria bancrofti infection is a leading cause of lymphatic filariasis.
• Lymphatic filariasis affects millions globally, leading to significant morbidity.
• Subclinical lymphatic changes in asymptomatic individuals are not well understood.

Purpose of the Study:

• To assess the extent of lymphatic disease in microfilaraemic Wuchereria bancrofti infected individuals using lymphoscintigraphy.
• To investigate if diethylcarbamazine citrate (DEC) treatment reverses lymphatic pathology.
• To correlate lymphoscintigraphy findings with antibody levels to filarial antigens.

Main Methods:

• Lymphoscintigraphy was used to examine superficial lymphatic drainage in the legs.
• Participants included endemic controls, asymptomatic microfilaraemic individuals, and patients with lymphoedema.
• Serum antibody levels to three recombinant filarial antigens were measured.

Main Results:

• Lymphoscintigraphy revealed significant lymphatic vessel calibre differences in microfilaraemic individuals compared to controls.
• Amicrofilaraemic patients with lymphoedema showed diffuse collateral vessel distribution.
• DEC treatment did not reverse the observed lymphatic pathology in previously microfilaraemic individuals.
• Lymphoscintigraphy patterns did not correlate with antibody levels.
• Subclinical lymphatic disease was detected in almost all asymptomatic microfilaraemic individuals.

Conclusions:

• Wuchereria bancrofti infection leads to subclinical lymphatic disease detectable by lymphoscintigraphy, even in asymptomatic individuals.
• Current DEC therapy clears microfilaraemia but does not reverse established lymphatic pathology.
• Lymphoscintigraphy is a valuable non-invasive tool for diagnosing lymphatic disease in Wuchereria bancrofti infection.