Mycobacteria in Terrestrial Small Mammals on Cattle Farms in Tanzania

Table 6

Mycobacteria detected in cow milk on the cattle farms.

Mycobacteria	Detected by PCR or culture
Human risk group 1^b
M. neoaurum	PCR
M. nonchromogenicum	Culture
M. nonchromogenicum ^a	Culture
M. gordonae	PCR
Human risk group 2^b
M. asiaticum	Culture
M. szulgai-like	Culture
Recently described species,; not yet classified ^b
M. engbaekii	Culture
M. goodii ^a	PCR
M. lacticola	PCR
M. septicum	PCR

^aThese mycobacteria were first detected in 2005 in R. rattus trapped on a farm and were later detected in 2006 in the milk of cattle residing on the same farm (see Table 3).
^bThe classification in human risk groups is based on the clinical point of view in which human risk group 1 contain species that never or with extreme rarity cause disease. Human risk group 2 are species that normally live freely in the environment but also cause opportunistic infections in humans. Human risk group 3 are the obligate pathogens (M. tuberculosis complex and M. leprae) [52].