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2015 ; 10
(10
): e0135877
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English Wikipedia
Evaluation of Giant African Pouched Rats for Detection of Pulmonary Tuberculosis
in Patients from a High-Endemic Setting
#MMPMID26445086
Reither K
; Jugheli L
; Glass TR
; Sasamalo M
; Mhimbira FA
; Weetjens BJ
; Cox C
; Edwards TL
; Mulder C
; Beyene NW
; Mahoney A
PLoS One
2015[]; 10
(10
): e0135877
PMID26445086
show ga
BACKGROUND: This study established evidence about the diagnostic performance of
trained giant African pouched rats for detecting Mycobacterium tuberculosis in
sputum of well-characterised patients with presumptive tuberculosis (TB) in a
high-burden setting. METHODS: The TB detection rats were evaluated using sputum
samples of patients with presumptive TB enrolled in two prospective cohort
studies in Bagamoyo, Tanzania. The patients were characterised by sputum smear
microscopy and culture, including subsequent antigen or molecular confirmation of
Mycobacterium tuberculosis, and by clinical data at enrolment and for at least
5-months of follow-up to determine the reference standard. Seven trained giant
African pouched rats were used for the detection of TB in the sputum samples
after shipment to the APOPO project in Morogoro, Tanzania. RESULTS: Of 469
eligible patients, 109 (23.2%) were culture-positive for Mycobacterium
tuberculosis and 128 (27.3%) were non-TB controls with sustained recovery after 5
months without anti-TB treatment. The HIV prevalence was 46%. The area under the
receiver operating characteristic curve of the seven rats for the detection of
culture-positive pulmonary tuberculosis was 0.72 (95% CI 0.66-0.78). An optimal
threshold could be defined at ? 2 indications by rats in either sample with a
corresponding sensitivity of 56.9% (95% CI 47.0-66.3), specificity of 80.5% (95%
CI 72.5-86.9), positive and negative predictive value of 71.3% (95% CI 60.6-80.5)
and 68.7% (95% CI 60.6-76.0), and an accuracy for TB diagnosis of 69.6%. The
diagnostic performance was negatively influenced by low burden of bacilli, and
independent of the HIV status. CONCLUSION: Giant African pouched rats have
potential for detection of tuberculosis in sputum samples. However, the
diagnostic performance characteristics of TB detection rats do not currently meet
the requirements for high-priority, rapid sputum-based TB diagnostics as defined
by the World Health Organization.