ABSTRACT
SETTING: Three teaching hospitals in Ghana. OBJECTIVE: To elucidate trends in demographics, clinical characteristics and treatment outcomes in extrapulmonary TB (EPTB) patients. DESIGN: This was a retrospective study involving the review and comparison of EPTB and pulmonary TB (PTB) data from 1 January 2008 to 31 December 2017 in TB registers and treatment cards. RESULTS: Of 15,392 TB cases, 4607 (30%) were EPTB, including 4477/4607 (97%) new cases. There were 2,679/4607 (58%) males and the age range was 0.3 to 96 years. Pleural TB (1021/4607, 22%) was the most common. Treatment success rates for EPTB and PTB were respectively 72% and 84%. HIV positivity was high among patients with disseminated/miliary TB (429/779, 55%) and TB meningitis (242/526, 46%). To note, disseminated/miliary TB (χ2 = 33.53, P < 0.0001) increased, whereas TB meningitis (χ2 = 19.43, P < 0.0001) decreased over the 10-year period. Mortality among EPTB patients was associated with increasing age (⩾25 years), disseminated/miliary TB, TB meningitis and HIV positivity. CONCLUSIONS: There is male preponderance for both EPTB and PTB in Ghana. Increasing age, disseminated/ miliary TB, TB meningitis and HIV are risk factors for mortality among EPTB patients. This emphasises the need for public education on the risk factors for EPTB and preventive strategies.
CONTEXTE: Trois centres hospitalières universitaires au Ghana. OBJECTIF: Elucider les tendances démographiques, les caractéristiques cliniques et les résultats du traitement de patients atteints de TB extrapulmonaire (EPTB) au Ghana. SCHEMA: Ceci est une étude rétrospective de revue et de comparaison des données de EPTB et de TB pulmonaire (PTB) du 1e janvier 2008 au 31 décembre 2017 dans les registres de TB et les cartes de traitement. RESULTATS: Sur 15 392 cas de TB, 4607 (30%) étaient des EPTB dont 4477/4607 (97%) étaient de nouveaux cas. Les hommes représentaient 2679/4607 (58%) et leur âge allait de 0,3 à 96 ans. Une TB pleurale 1021/4607 (22%) était la plus fréquente. Le taux de réussite du traitement de la EPTB et de la PTB a été de 72% et 84%, respectivement. La positivité au VIH était élevée parmi les patients atteints de TB disséminée/miliaire (429/779 ; 55%) et de méningite tuberculeuse (242/526 ; 46%). Il est significatif que la TB disséminée/miliaire (χ2 = 33,53 ; P < 0,0001) a augmenté tandis que la méningite TB (χ2 = 19,43, P < 0,0001) a diminué au long de la période de 10 ans. La mortalité des patients EPTB a été associée à un âge croissant (≥25 ans), une forme disséminée/miliaire, à une méningite TB et à la positivité au VIH. CONCLUSIONS: Il y a une prépondérance masculine à la fois de la EPTB et de la PTB au Ghana. Un âge croissant, une forme disséminée/ miliaire, une méningite TB et le VIH sont des facteurs de risque de mortalité pour les patients EPTB. Ceci met l'accent sur le besoin d'éducation du public relative aux facteurs de risque et aux stratégies de prévention.
ABSTRACT
Buruli ulcer disease caused by Mycobacterium ulcerans results in extensive destruction of skin and soft tissue and long-term functional disabilities that ultimately require surgery and rehabilitation. The disease is associated with aquatic and swampy environments with the mycobacterium occurring in biofilms, soil, aquatic insects, fish and wildlife however, the mode of transmission to humans remains an enigma. Current transmission ideas including bites from predatory water bugs and mosquitoes, do not explain satisfactorily the spasmodic disease distribution in human populations. Here we argue that Acanthamoeba species are the natural hosts of M. ulcerans and are mainly responsible for disease transmission because; (i) Acanthamoebae are known natural hosts of several microbial pathogens including M. marinum, M. avium and Legionella pneumophila, (ii) culture of slow-to-grow microbial pathogens hosted in nature by Acanthamoeba spp is enhanced when the media is seeded with the protozoa, (iii) acanthamoebae and M. ulcerans share similar bio-ecological and epidemiological settings, (iv) documented evidence that prior growth of L. pneumophila and M. avium in acanthamoebae influences entry mechanisms, intracellular growth and virulence in human monocytes, (v) Acanthamoeba spp also infect humans and cause diseases via routes of openings including broken skin and sites of trauma similar to M. ulcerans and (vi) M. ulcerans is rather a fastidious intracellular organism as recent analysis of the genome indicate. We argue further that temperature plays a significant role in transmission determining the fate of either the intracellular microbe or the host cells. Also, Acanthamoeba-pathogen association has a long evolutionary history because the same set of bacterial genes and gene products e.g. in L. pneumophila are required for survival in both mammalian and protozoan host cells. We suggest that the involvement of Acanthamoeba in the transmission of M. ulcerans to humans better explains the disease's epidemiology.
