Mycobacterium kansasii infection in squirrel monkeys (Saimiri sciureus sciureus)

Area of Science:

• Veterinary Medicine
• Microbiology
• Primate Health

Background:

• Tuberculin positivity in squirrel monkeys can indicate prior exposure to mycobacteria.
• Non-human primates are susceptible to various mycobacterial infections.

Observation:

• Four out of five tuberculin-positive squirrel monkeys exhibited asymptomatic infections.
• Mycobacterium kansasii was identified as the causative agent in three monkeys through culture of bronchial lymph nodes.

Findings:

• Polymerase chain reaction (PCR) analysis of mycobacterial DNA from lymph nodes ruled out common species like M. tuberculosis, M. avium, and M. intracellulare.
• The specific diagnosis of Mycobacterium kansasii was confirmed via culture, indicating an atypical mycobacterial infection.

Implications:

• This study highlights Mycobacterium kansasii as a potential pathogen in squirrel monkey populations.
• The unidentified source of infection warrants further investigation into environmental or transmission routes in captive or wild primates.
• Asymptomatic infections pose diagnostic challenges and emphasize the need for comprehensive mycobacterial screening in susceptible animal populations.