Experimental leprosy in a rhesus monkey: necropsy findings

Area of Science:

• Primatology
• Infectious Diseases
• Pathology

Background:

• Leprosy, caused by Mycobacterium leprae, poses a significant global health challenge.
• Animal models are crucial for understanding leprosy pathogenesis and developing treatments.
• Previous animal models have limitations in fully recapitulating human leprosy.

Purpose of the Study:

• To evaluate the rhesus monkey (Macaca mulatta) as a potential animal model for leprosy.
• To assess the susceptibility of rhesus monkeys to Mycobacterium leprae infection.

Main Methods:

• A 6-month-old rhesus monkey was inoculated with Mycobacterium leprae from a naturally infected mangabey.
• Inoculation routes included intravenous and intracutaneous administration.
• The animal was monitored for 56 months, followed by detailed pathological examination.

Main Results:

• The rhesus monkey developed generalized lepromatous leprosy.
• Lesions were found in the skin, nasal mucosa, peripheral nerves, and lymph nodes.
• Viscera showed relative sparing, and the monkey tested negative for STLV-III infection.

Conclusions:

• The rhesus monkey serves as a viable animal model for studying leprosy.
• This model can aid in understanding Mycobacterium leprae infection and disease progression.
• Further research using this model may accelerate the development of new leprosy therapies.