Context: The M. tuberculosis complex (MTBC) includes four other TB-causing mycobacteria: M. bovis, M. africanum, M. canetti, and M. microti. M. africanum is not widespread, but it is a significant cause of tuberculosis in parts of Africa. M. bovis was once a common cause of tuberculosis, but the introduction of pasteurized milk has almost completely eliminated this as a public health problem in developed countries. M. canetti is rare and seems to be limited to the Horn of Africa, although a few cases have been seen in African emigrants. M. microti is also rare and is seen almost only in immunodeficient people, although its prevalence may be significantly underestimated.

Question: Which mycobacterium that causes TB can often be found in unpasteurized milk?
Answer: M. bovis

Question: Which one of the tuberculosis mycobacteria is associated with the Horn of Africa?
Answer: M. canetti

Question: Which of the four TB-causing bacteria do scientists think might be more common than we know?
Answer: M. microti

Question: What bacterium has the name of the country it affects most in its name?
Answer: M. africanum

Question: How many M. tuberculosis complexes are there?
Answer: Unanswerable

Question: Which parts of Africa is M. africanum most common in?
Answer: Unanswerable

Question: African emigrants are not likely to get what disease in the Horn of Africa?
Answer: Unanswerable

Question: What form of tuberculosis has pasteurized milk caused?
Answer: Unanswerable

Question: Which bacterium has likely been overestimated?
Answer: Unanswerable