Cryptosporidium and cryptosporidiosis.

Thesis (M.Med.Sc.)-University of Natal, Durban, 1990.Cryptosporidium parvum can cause debilitating disease in immunocompetent persons with cholera-like symptoms characterised by self-limiting, profuse diarrhoea; on the other hand asymptomatic infection with this organism frequently occurs. However, in immunocompromised patients, the disease is more severe and is lifethreatening. A pivotal aspect of the present survey was a comparative assessment of four commonly used staining techniques (viz. modified Ziehl-Neelsen, safranin-methylene blue, auramine phenol fluorescence and Sheather's sucrose flotation) for the detection and identification of Cryptosporidium oocysts. The Sheather's flotation method proved to be superior to the other three procedures which were not only less sensitive but also less specific. A modification of the Sheather's flotation technique was developed for use with diarrhoeal stools; this was found to be simple, reliable, costeffective and the least time consuming of the above methods; this was used exclusively in a subsequent survey of the association of Cryptosporidium infection with diarrhoea in hospitalised children. Although previous epidemiological surveys of cryptosporidiosis have been conducted in South Africa standardised methods have not been employed. This initial assessment of diagnostic techniques therefore provided a tool for accurately assessing the importance of Cryptosporidium as a causative organism of diarrhoea. In an extensive study performed on children younger than 10 years old, who were hospitalised with a primary diagnosis of diarrhoea at King Edward VIII Hospital, it was found that 9,0% (111/1229) were passing Cryptosporidium oocysts; this was the second most common enteric pathogen. In 72% (80/111) of patients with Cryptosporidium infections it was the only pathogen. The prevalence of cryptosporidiosis was highest during the months of February, March, April and May; direct correlation between the rainfall in the Durban area and the prevalence of cryptosporidiosis was demonstrated (r = 0,6125). Cryptosporidium infection was more prevalent in the 4-6 month age group (p = 0,001). The fact that Cryptosporidium infections may be symptomatic in some individuals and asymptomatic in others, suggests that strain differences in respect of pathogenic potential may occur. A prerequisite to the investigation of strain differences was to increase parasite numbers; both in vivo and in vitro culture techniques were employed. Culture in chicken embryos failed to increase the parasite population and only limited areas of the chorio-allantoic membranes showed a few developmental stages. Cell cultures proved to be more suitable for Cryptosporidium growth and parasite numbers increased proportionally with duration in culture. Attempts at infecting suckling Balb/c mice were unsuccessful; however experimental infection of immunosuppressed adult rats facilitated the examination of various developmental stages of the parasite. Isoenzyme electrophoresis is an excellent method for demonstrating polymorphism in many species. Of the five enzyme systems that were tested, glucose phosphate isomerase, malic enzyme and phosphoglucose dehydrogenase proved to be the most promising. The electrophoresis of lysates, prepared from oocysts, in an agarose gel system was found to give adequate and reproducible resolution of isoenzyme patterns. Isoenzyme polymorphism could be demonstrated in oocysts harvested from the stools of four children. Such polymorphism has not been described previously and indicates a more extensive study to investigate strain differences, and to correlate these with the clinical histories of infected subjects. This approach may be invaluable in elucidating the pathogenesis of Cryptosporidium infections in man

Improving adolescent maternal health.

CAPRISA, 2015.Abstract available in pdf

Hepatitis B and HIV co-infection in pregnant women: Indication for routine antenatal hepatitis B virus screening in a high HIV prevalence setting

Background. Sub-Saharan Africa is endemic for hepatitis B virus (HBV) and human immunodeficiency virus (HIV) infections. HBV/HIV co-infection in women of reproductive age is of clinical and public health importance because these women constitute a significant reservoir for horizontal and perinatal HBV transmission. Childhood HBV vaccination from 6 weeks of age protects most children against chronic HBV infection. However, infants born to HBV/HIV co-infected women are more likely to be infected perinatally, with an increased risk of chronic hepatitis, than infants born to HBV mono-infected women.Objectives. The aim of our study was to establish the prevalence of HBV infection and HBV/HIV co-infection in pregnant women in KwaZulu-Natal, South Africa, to inform antenatal HBV screening and childhood immunisation policies in South Africa.Methods. Stored plasma specimens obtained from 570 pregnant women were tested for hepatitis B surface antigen (HBsAg) and HBV infectivity, as characterised by the presence of hepatitis B e antigen (HBeAg) and/or HBV DNA load.Results. The antenatal HIV prevalence and HBsAg prevalence in this study were 41.6% and 5.3% (95% confidence interval (CI) 3.4 - 7.1%), respectively. Overall, 3.1% (95% CI 1.7 - 4.6%) of pregnant women were HBV/HIV co-infected, with HBeAg positivity and the HBV DNA load being significantly higher in co-infected women.Conclusion. We report a 5.3% HBV prevalence and a 3.1% HBV/HIV co-infection prevalence in pregnant women from this HIV-endemic region. Routine antenatal HBV screening will allow early identification of neonates who require HBV active-passive immunoprophylaxis at birth. This strategy, together with antenatal antiretrovirals, will reduce the risk of perinatal HBV transmission, especially in high-risk HBV/HIV co-infected pregnant women

Diagnosis and disclosure of HIV status: Implications for women’s risk of physical partner violence in the postpartum period

This study prospectively examined whether HIV leads to elevated risk for intimate partner violence (IPV) for women, and how this risk varies depending on HIV status disclosure to a partner

HIV+ women's narratives of non-disclosure: Resisting the label of immorality

Increasing partner disclosure rates among HIV positive individuals is widely seen as an important public health strategy to reduce HIV transmission. One approach for encouraging disclosure is to emphasize individuals’ moral responsibility to disclose their status to their partners. We use South Africa as a case study to draw attention to two problems with labeling non-disclosure as immoral. First, we argue that because women are tested for HIV at much higher rates than men, any approach that involves blaming HIV positive individuals for not disclosing their status will disproportionately burden women. Second, through the narratives of six HIV positive women, we highlight how a focus on morality undervalues the complexity of sexual partnerships. Specifically, women describe how their perceived obligation to disclose is directly influenced by communication with their sexual partners. Women also discuss how the onset of different life events might alter the meaning of HIV and change obligations regarding disclosure within the partnership. The differences in testing rates across gender combined with the complexity of sexual partnerships leads us to suggest that labeling non-disclosure as immoral does little to advance HIV prevention. There is an urgent need to identify alternative interventions that support women through the disclosure process

Defining Male Support During and After Pregnancy From the Perspective of HIV-Positive and HIV-Negative Women in Durban, South Africa

Greater male support during pregnancy and in the postpartum period may improve health outcomes for mothers and children. To develop effective strategies to engage men we need to first understand the ways that men are currently engaged and the barriers to their greater involvement. We conducted in-depth interviews in isiZulu with 30 HIV-positive women and 16 HIV-negative women who received prenatal care from a public clinic in Durban, South Africa. Interviews were audiotaped, transcribed, translated, and coded for analysis. While less than a quarter of women reported that their partners accompanied them to the clinic, they described receiving other material and psychosocial support from partners. More HIV-positive women reported that their partners were not involved or not supportive, and in some cases direct threats and experiences with violence caused them to fear partner involvement. We need to broaden the lens through which we consider male support during pregnancy and in the postpartum period, and acknowledge that male involvement may not always be in the best interest of women. Engaging supportive partners outside of the clinic setting and incorporating other important social network members are important next steps in the effort to increase support for women

A bird’s eye view of PMTCT coverage at two regional hospitals and their referral clinics in a resource-limited setting

Background. While countries strengthen their health information systems, local health managers require alternative strategies to monitor their prevention of mother-to-child (PMTCT) programmes to improve coverage and service delivery. Objective. To demonstrate the use of a postpartum audit to establish PMTCT coverage and programme deficiencies at hospitals and multiple primary health care facilities. Methods. A cross-sectional hospital-based medical chart audit of pregnant women admitted in labour to their regional hospital. Their antenatal hand-held medical records were added to a hospital-issued maternity chart that was used to record further obstetric and perinatal management during their hospital stay. Women recuperating in the postnatal wards up to 48 hours after delivery at two hospitals in KwaZulu-Natal participated. Data included their antenatal attendance, access to HIV counselling and testing (HCT), and access to nevirapine (NVP) for PMTCT. Results. Fifty-three clinics were indirectly evaluated as a result of the postpartum audit. All clinics provided HCT and the average HIV testing rate was 91% (range 40 - 100); 15% (N=8) of these clinics with HIV testing rates o

Postpartum Family Planning Service Provision in Durban, South Africa: Client and Provider Perspectives

Researchers in sub-Saharan Africa have found health facility factors influence client contraceptive use. We sought to understand how client provider interactions, discussion of side effects and HIV status influence women’s contraceptive use post-partum. We conducted in-depth interviews with 8 HIV negative clients and 6 HIV positive clients in Zulu and with 5 nurses in English. Interviews were translated and transcribed into English. We created a codebook and coded all transcripts. Nurses and clients reported limited time to discuss contraception, side effects and HIV. Nurses did not comply with national contraceptive policies and created unnecessary barriers to contraceptive use

Legal knowledge, needs, and assistance seeking among HIV positive and negative women in Umlazi, South Africa

Background The rights of women and people living with HIV (PLHIV) are protected under South African law, yet there is a gap in the application of these laws. While there are numerous systemic and social barriers to women's and PLHIV's exercise of their legal rights and rights to access social services, there has been little effort to document these barriers as well as legal needs and knowledge in this context. Methods 1480 HIV-positive and HIV-negative women recruited from an antenatal clinic in Umlazi Township completed a questionnaire on legal knowledge, experience of legal issues, assistance seeking for legal issues, and barriers to seeking assistance. We compared the legal knowledge and experience of legal issues of HIV-positive and HIV-negative women, and described assistance seeking and barriers to assistance seeking among all women. Results Both HIV-positive and HIV-negative women had high levels of knowledge of their legal rights. There were few important differences in legal knowledge and experience of legal issues by HIV status. The most common legal issues women experienced were difficulty obtaining employment (11 %) and identification documents (7 %). A minority of women who had ever experienced a legal issue had sought assistance for this issue (38 %), and half (50 %) of assistance sought was from informal sources such as family and friends. Women cited lack of time and government bureaucracy as the major barriers to seeking assistance. Conclusions These results indicate few differences in legal knowledge and needs between HIV-positive and HIV-negative women in this context, but rather legal needs common among women of reproductive age. Legal knowledge may be a less important barrier to seeking assistance for legal issues than time, convenience, and cost. Expanding the power of customary courts to address routine legal issues, encouragement of pro bono legal assistance, and introduction of legal navigators could help to address these barriers

Antiretroviral drug regimens to prevent mother-to-child transmission of HIV : a review of scientific, program, and policy advances for sub-Saharan Africa.

CAPRISA 2013.Considerable advances have been made in the effort to prevent mother-to-child HIV transmission (PMTCT) in sub-Saharan Africa. Clinical trials have demonstrated the efficacy of antiretroviral regimens to interrupt HIV transmission through the antenatal, intrapartum, and postnatal periods. Scientific discoveries have been rapidly translated into health policy, bolstered by substantial investment in health infrastructure capable of delivering increasingly complex services. A new scientific agenda is also emerging, one that is focused on the challenges of effective and sustainable program implementation. Finally, global campaigns to “virtually eliminate” pediatric HIV and dramatically reduce HIV-related maternal mortality have mobilized new resources and renewed political will. Each of these developments marks a major step in regional PMTCT efforts; their convergence signals a time of rapid progress in the field, characterized by an increased interdependency between clinical research, program implementation, and policy. In this review, we take stock of recent advances across each of these areas, highlighting the challenges – and opportunities – of improving health services for HIV-infected mothers and their children across the region