Tuberculosis 2006
Although bovine tuberculosis is widespread throughout Africa, very
little is known about risk factors for Mycobacterium bovis infection in either human
or cattle populations. A human case–control study was conducted in northern
Tanzania, comparing risk factors and prevalence of cattle interdermal test positives
of cases (cervical adenitis cases from which M. bovis was isolated) with age- and sexmatched
controls (selected at random from potential hospital attendees within the
community). A cattle cross-sectional study was also set-up involving 27 villages
selected at random in four districts, with 10,549 cattle and 622 herds tested, and
questionnaire surveys conducted in 239 households. M. bovis was confirmed in seven
of 65 (10.8%) human cervical adenitis cases, of which only one came from a
household owning infected cattle. M. bovis in human patients was associated with
families in which a confirmed diagnosis of tuberculosis had previously been made
(po0:001) and with households far (4100 m) from neighbours (p ¼ 0:003). In cattle,
overall prevalence of intradermal test positives was low at 0.9% (0.70–1.06%), but widespread, with 11.8% (8.44–13.17%) herds containing at least one reactor.
Prevalence of intradermal test positives increased significantly with cattle age
(po0:001). Herds with the following risk factors had a significantly greater
prevalence of intradermal test positives: 450 cattle in the herd (p ¼ 0:024); herds
housed inside at night (p ¼ 0:021) and herds in contact with wildlife (p ¼ 0:041).
Furthermore, villages that experienced annual flooding had a higher prevalence of
infection (p ¼ 0:043).