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 Table of Contents  
FULL LENGTH ARTICLE
Year : 2016  |  Volume : 5  |  Issue : 4  |  Page : 392-399

Extrapulmonary tuberculosis among females in South Asia—gap analysis


1 World Health Organization, Regional Country Office, Islamabad; Polio Eradication and Immunization Cell, Emergency Operations Center (EOC) Sindh, Karachi, Pakistan
2 Aga Khan University Medical College, Karachi, Pakistan
3 Department of Pathology & Laboratory Medicine, Aga Khan University Hospital, Karachi, Pakistan

Date of Web Publication14-Feb-2017

Correspondence Address:
Rumina Hasan
Department of Pathology & Laboratory Medicine, Aga Khan University Hospital, Stadium Road, PO Box 3500, Karachi 74800
Pakistan
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Source of Support: None, Conflict of Interest: None


DOI: 10.1016/j.ijmyco.2016.09.054

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  Abstract 


The percentage of extrapulmonary tuberculosis (EPTB) among new and relapse tuberculosis cases in South Asia (Afghanistan, Pakistan, India, and Bangladesh) ranged from 19% to 23% in 2014. While tuberculosis was reportedly more prevalent in males, a higher preponderance of EPTB was observed in females. National tuberculosis control programs are highly focused on pulmonary tuberculosis. This creates gaps in the surveillance, diagnosis, and study of EPTB among females, which is especially pronounced in the South Asian setting. We have reviewed recently published literatures from January 2010 to June 2016 reporting EPTB in females with a view to evaluate the current epidemiology, risk factors, diagnostic modalities, and treatment outcomes. We report significant gaps in the surveillance of EPTB among women in South Asia, emphasizing the need for greater focus on EPTB in females to overcome current surveillance and knowledge gaps.

Keywords: Tuberculosis, Females, Female:male ratio, South Asia


How to cite this article:
Mehraj J, Khan ZY, Saeed DK, Shakoor S, Hasan R. Extrapulmonary tuberculosis among females in South Asia—gap analysis. Int J Mycobacteriol 2016;5:392-9

How to cite this URL:
Mehraj J, Khan ZY, Saeed DK, Shakoor S, Hasan R. Extrapulmonary tuberculosis among females in South Asia—gap analysis. Int J Mycobacteriol [serial online] 2016 [cited 2022 May 20];5:392-9. Available from: https://www.ijmyco.org/text.asp?2016/5/4/392/200121




  Introduction Top


Globally, tuberculosis (TB) is among the top five killers of women aged 20–59 years [1]. While the proportion of pulmonary TB (PTB) notifications is higher among males worldwide, TB in females remains a major threat to control due to the impact felt by households, particularly children. It has been argued that the higher case notifications among males may reflect the barriers faced by the female population in accessing health care [2]. Extrapulmonary tuberculosis (EPTB) accounted for 15% of the new and relapse TB cases in 2014 [3]. In contrast to PTB, preponderance for EPTB is reportedly higher among females [4],[5],[6]. Irrespective of whether the underlying mechanism is biological, socioeconomic, or cultural, a deeper understanding of the risk factors, impact, access to directly observed therapy (DOT), as well as diagnosis of all forms of TB among females is necessary to devise effective control strategies. This is imperative as the millennium development goals, despite achieving progress, faltered in addressing gender disparity, in assessing impact of TB on maternal mortality, and/or indeed in TB control, especially in South Asia [5].

Among the South Asian countries, Pakistan, India, and Bangladesh are included in the category of high-burden countries for TB and MDR (Multidrug resistant) TB [6]. Although post 2015, Afghanistan is not included in high-burden countries; it has the second highest TB burden in World Health Organization's Eastern Mediterranean Region [3].

In keeping with the stalled progress of Millennium Development Goals 3, 5, and 6 (i.e., reducing gender disparity, decreasing maternal mortality, and decreasing the TB burden), efforts to control EPTB among women in South Asia need to be reassessed to identify the gaps in knowledge and/or services. In this review, we aimed at assessing the extent of gender disparity in EPTB in Afghanistan, Pakistan, India, and Bangladesh through researching published literatures over the past 6 years. We further sought to determine the organ systems affected and assess outcome data for EPTB in women available from South Asia, as well as evaluate the utility of diagnostic modalities used for EPTB in high-TB-burden countries of South Asian region. The search results are presented, and the resulting information gaps are highlighted.


  Methods Top


Search strategy

A PubMed systematic literature search was performed for English-language articles related to EPTB among females in South Asia, published between January 2010 and June 2016. Unpublished and ongoing studies could not be explored in this review. We used the following terms in our search, individually as well as in various combinations: tuberculosis women, females, Pakistan, Afghanistan, India, Bangladesh, extrapulmonary, genitourinary, infertility, postpartum, placenta, Asherman syndrome, peritoneal, tubo-ovarian, and endometrium. Two independent reviewers (J.M. and Z.Y.K.) reviewed the titles, abstracts, and full-text articles, and selected potentially relevant studies based on inclusion criteria established prior to the literature search. Discrepancies arising between the reviewers were resolved by consensus in consultation with a third reviewer (R.H.).

Inclusion criteria

We included observational studies including case series, surveys, and descriptive cross-sectional studies focusing on EPTB and PTB among females in specified South Asian countries.

Exclusion criteria

We excluded all studies focusing only on diagnostic criteria, clinical trials on drugs, case reports or case series without details of EPTB and PTB, and articles focusing only on genetic analysis and nonhuman studies. Studies that were conducted in countries other than the specified countries of the Asian region were also excluded.

Outcomes of interest

Reported cases of EPTB among males and females, female:male ratio (FMR) in reported studies, site of EPTB in females, and diagnostic modalities used for diagnosis of different types of EPTB were evaluated as outcomes in the review. We also reviewed studies on PTB published in the same time period, in order to compare between FMRs of EPTB and PTB.


  Results Top


Search results and studies selected for review

A total of 31 studies on PTB and EPTB (published during 2010–2016) were selected for review. Among these studies, 11 presented data on PTB, 13 presented data on EPTB, while seven reported data on both PTB and EPTB. All seven studies provided proportions for both EPTB and PTB, but only two studies reported separate data on EPTB and PTB for both males and females [9],[10]. Among the 20 EPTB studies reviewed, 19 studies reported on EPTB in females; 12 were from India, five from Pakistan, and one each from Afghanistan and Bangladesh. Among 18 studies reporting on PTB, one was from Bangladesh, eight were from India, and nine were from Pakistan.

The overall selection process and characteristics of the excluded studies are summarized in Fig. S1. Excluded studies are listed together with the reason for exclusion in the [Table S1].

Study sample characteristics

All 19 studies on EPTB were conducted in health care settings (hospitals, clinics, diagnostic centers, etc.), and in 10 studies data were extracted from hospital records. Age ranges for patients in these studies varied from 15 years to 70 years. The total numbers of patients were 8,829 (ranging from a minimum of 37 to a maximum of 1,994) in these studies. Characteristics of the studies included in this review are summarized in [Table 1].
Table 1: Summary of characteristics of the studies included in the review and proportion of extrapulmonary tuberculosis among participants in South Asia (Afghanistan, Bangladesh, India, and Pakistan).

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[Table S2] presents details of studies reporting on PTB, which were also reviewed for comparison of FMRs in PTB with EPTB. Compared with PTB studies, sample sizes were smaller for EPTB studies.

Types of EPTB among females

Six studies reported distribution of EPTB according to disease sites among females. Among these, only two studies reported various types of EPTB [20],[11], while the other four [9],[19],[20],[21] were based on gender-specific cohorts of women tested for or diagnosed with infertility. Of the two studies reporting on distribution by site, TB adenitis was the commonest form, followed by pleural TB, central nervous system TB, musculoskeletal (bone) TB, and abdominal TB.

FMR in EPTB and PTB

The proportion of women with EPTB in the studies reviewed was in the range of 10–74.7%. The FMR was 0.6–2.9. Of the 19 studies included, 10 provided data on FMRs in EPTB. These studies suggest that FMR varies with higher ratios toward the western part of the region: 1.9–2.9 in Afghanistan and Pakistan versus 0.6–1.7 in India and Bangladesh.

The analysis also aimed at evaluating whether there were any reported gender-associated differences among sites of EPTB. FMR in EPTB by site of involvement of organs is presented in [Table S3]. Most studies showed a slightly greater incidence of abdominal TB in males as compared with females, while central nervous system, pleural, and cutaneous TB were present in an equal proportion among both genders. The literature reviewed reported more dominance of lymph node, bone, pericardial, breast, genitourinary, and miliary TB in females as compared with males.

In contrast, PTB was more common in males than in females. However, the FMR varied by study and geographical location (Fig. S2).

Risk factors

Although a number of studies documented socioeconomic factors in EPTB cases, none explored risk factors for TB and/or for EPTB in women. Where presented, a history of contact or Mantoux test results were not analyzed separately for females or those affected by TB among a cohort, or for EPTB.

Diagnostic modalities

Diagnostic modalities most relied upon for diagnosis of EPTB were histopathology followed by microscopy. In histopathology, presence of granuloma was frequently taken as evidence of TB. Extent of testing to exclude other etiologies presenting as granulomas was discussed in only one instance where the authors cited insufficient facilities to exclude other etiologies [8]. [Table 2] presents the combinations of various diagnostic modalities used in reviewed studies.
Table 2: Investigative modalities used in research studies to diagnose EPTB in females, 2010–2016.

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The use of adenine deaminase activity was reported in one study [9], whereas the use of radiological evidence was included in five studies.

DOT coverage

Although seven of 18 studies reporting EPTB were from program-related sites [9],[10],[20],[21],[27],[28],[29], they did not report on DOT coverage among females affected by EPTB. The majority of the remaining 11 studies were from tertiary care facilities or advanced diagnostic centers (mainly for infertility) that did not reveal links with DOT programs.

Treatment outcome

Outcome data on EPTB were scanty, although poorer outcomes for EPTB as compared with PTB were reported in one study albeit without gender disaggregated rates [18], while another reported no difference by gender in EPTB outcomes [23]. Higher postsurgical complications were reported in females with genital TB [10],[13].

Gap analysis

From the body of literature published during 2010–2016, gaps were identified in a number of areas in EPTB among females. [Table 3] presents gap analysis results comparing available data with gaps in the information, knowledge, or surveillance required to inform epidemiology of, risk factors for, diagnostic needs for, and treatment outcomes for EPTB among females in South Asia.
Table 3: Based on publications of 2010–2016, surveillance, information, and knowledge gaps identified in EPTB studies on females in South Asia.

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  Discussion Top


From 2010 to mid-2016, research into EPTB among females in the South Asian countries of Afghanistan, Pakistan, India, and Bangladesh has not informed current epidemiology of TB. While several factors may be responsible for research studies falling short of this requirement (including funding, research capacity, and infrastructure), gender- and age-disaggregated data by site have also not been provided by the world TB reports published annually by the World Health Organization. This surveillance gap comprises the first of the many hurdles in understanding EPTB among females. The lack of robust diagnostic modalities for EPTB further widens these surveillance gaps. The advent of Xpert MTB/RIF (Cepheid, Sunnyvale, California, USA) test as an effective diagnostic test for EPTB [28] is expected to improve the diagnostic landscape. Future assessments of EPTB among females should, therefore, use advanced molecular tests as part of the algorithm used to establish the diagnosis of EPTB. Although significant progress has been made in strengthening the national TB program surveillance systems in case notifications and recording treatment outcomes in all four countries [3], gender stratified treatment outcome data on EPTB are not routinely recorded or presented. What follows is an unmet information gap in the factors associated (including resistance rates) with treatment failures among females with EPTB. These are important, as sequelae of EPTB among women of reproductive age group (except in TB adenitis) are associated with significant morbidity and even more seriously felt in maternal EPTB through impact on perinatal morbidity and mortality [29].

Other notable gaps include the lack of knowledge regarding EPTB risk factors among females. This is especially significant in view of the high FMRs in Afghanistan and western Pakistan, suggesting genetic predisposition to EPTB among indigenous ethnic populations. Moreover, diabetes and malnutrition, which are known risk factors for TB [30],[31], are also highly prevalent among females in South Asia [32],[33], but have not been analyzed as risk factors for EPTB.

Finally, the overarching gap is in the engagement of multisite health care providers in South Asia, as observed by limited integration of public private partnerships in study designs. The surveillance and knowledge gaps reinforce the importance of overcoming these gaps thorough collaboration with private health care providers to enhance surveillance and develop well-designed and large-scale research studies.


  Conclusion Top


There is a need to focus on EPTB among female populations to document the epidemiology in South Asia, and examine the risk factors, diagnostic modalities, treatment strategies, and outcomes to carry out preventive and control measures.


  Conflicts of interest Top


None to declare.


  Appendix A. Supplementary data Top


Supplementary data associated with this article can be found, in the online version, at http://dx.doi.org/10.1016/j.ijmyco. 2016.09.054.



 
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    Tables

  [Table 1], [Table 2], [Table 3]


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