Last data update: May 06, 2024. (Total: 46732 publications since 2009)
Records 1-6 (of 6 Records) |
Query Trace: Matambo S[original query] |
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Rotavirus Genotypes in Hospitalized Children with Acute Gastroenteritis Before and After Rotavirus Vaccine Introduction in Blantyre, Malawi, 1997 - 2019.
Mhango C , Mandolo JJ , Chinyama E , Wachepa R , Kanjerwa O , Malamba-Banda C , Matambo PB , Barnes KG , Chaguza C , Shawa IT , Nyaga MM , Hungerford D , Parashar UD , Pitzer VE , Kamng'ona AW , Iturriza-Gomara M , Cunliffe NA , Jere KC . J Infect Dis 2020 225 (12) 2127-2136 INTRODUCTION: Rotavirus vaccine (Rotarix®, RV1) has reduced diarrhea-associated hospitalizations and deaths in Malawi. We examined the trends in circulating rotavirus genotypes in Malawi over a 22-year period to assess the impact of RV1 introduction on strain distribution. METHODS: Data on rotavirus-positive stool specimens among children age <5 years hospitalized with diarrhea in Blantyre, Malawi before (July 1997 - October 2012, n=1765) and after (November 2012 - October 2019, n=934) RV1 introduction were analyzed. Rotavirus G and P genotypes were assigned using reverse transcription polymerase chain reaction. RESULTS: A rich rotavirus strain diversity circulated throughout the 22-year period; Shannon (H) and Simpson diversity (D) indices did not differ between the pre- and post-vaccine periods (H' p < 0.149: D' p < 0.287). Overall, G1 (n=268/924; 28.7%), G2 (n=308/924; 33.0%), G3 (n=72/924; 7.7%) and G12 (n=109/924; 11.8%) were the most prevalent genotypes identified following RV1 introduction. The prevalence of G1P[8] and G2P[4] genotypes declined each successive year following RV1 introduction, and were not detected after 2018. Genotype G3 re-emerged and became the predominant genotype from 2017. No evidence of genotype selection was observed seven years post-RV1 introduction. CONCLUSION: Rotavirus strain diversity and genotype variation in Malawi is likely driven by natural mechanisms rather than vaccine pressure. |
Rapid antiretroviral therapy initiation in the Botswana Combination Prevention Project: a quasi-experimental before and after study
Lebelonyane R , Bachanas P , Block L , Ussery F , Abrams W , Roland M , Theu J , Kapanda M , Matambo S , Lockman S , Gaolathe T , Makhema J , Moore J , Jarvis JN . Lancet HIV 2020 7 (8) e545-e553 BACKGROUND: Ensuring that individuals who are living with HIV rapidly initiate antiretroviral therapy (ART) is an essential step in meeting the 90-90-90 targets. We evaluated the feasibility and outcomes of rapid ART initiation in the Botswana Combination Prevention Project (BCPP). We aimed to establish whether simplified ART initiation with the offer of same-day treatment could increase uptake and reduce time from clinic linkage to treatment initiation, while maintaining rates of retention in care and viral suppression. METHODS: We did a quasi-experimental before and after study with use of data from the BCPP. The BCPP was a community-randomised HIV-prevention trial done in 30 communities across Botswana from Oct 1, 2013, to June 30, 2018. Participants in the 15 intervention clusters, who were HIV-positive and not already taking ART were offered universal HIV-treatment and same-day ART with a dolutegravir-based regimen at first clinic visit. This rapid ART intervention was implemented mid-way through the trial on June 1, 2016, enabling us to determine the effect of rapid ART guidelines on time to ART initiation and rates of retention in care and viral suppression at 1 year in the BCPP intervention group. FINDINGS: We assessed 1717 adults linked to study clinics before rapid ART introduction and 800 after rapid ART introduction. During the rapid ART period, 457 (57·1%, 95% CI 53·7-60·6) individuals initiated ART within 1 day of linkage, 589 (73·7%, 70·6-76·7) of 799 within 1 week, 678 (84·9%, 82·4-87·3) of 799 within 1 month, and 744 (93·5%, 91·6-95·1) of 796 within 1 year. Before the introduction of rapid ART, 163 (9·5%, 95% CI 8·2-11·0) individuals initiated ART within 1 day of linkage, 276 (16·1%, 14·4-17·9) within 1 week, 839 (48·9%, 46·5-51·3) within 1 month, and 1532 (89·2%, 87·7-90·6) within 1 year. 1 year after ART initiation, 1472 (90·5%, 87·4-92·8) of 1627 individuals who linked in the standard ART period were in care and had a viral load of less than 400 copies per mL, compared with 578 (91·6%, 88·1-94·1) of 631 in the rapid ART period (risk ratio 1·01, 95% CI 0·92-1·11). INTERPRETATION: Our findings provide support for the WHO recommendations for rapid ART initiation, and add to the accumulating evidence showing the feasibility, acceptability, and safety of rapid ART initiation in low-income and middle-income country settings. FUNDING: US President's Emergency Plan for AIDS Relief. |
Advanced HIV disease in the Botswana Combination Prevention Project: prevalence, risk factors, and outcomes
Lebelonyane R , Mills LA , Mogorosi C , Ussery F , Marukutira T , Theu J , Kapanda M , Matambo S , Block L , Raizes E , Makhema J , Lockman S , Bachanas P , Moore J , Jarvis JN . AIDS 2020 34 (15) 2223-2230 OBJECTIVE(S): To determine the proportion of individuals linking to HIV-care with advanced HIV-disease (CD4 ≤200 cells/μL) in the Botswana Combination Prevention Project, describe the characteristics of these individuals, and examine treatment outcomes. DESIGN: A sub-analysis of a cluster-randomized HIV-prevention trial. HIV status was assessed in 16-64-year-olds through home and mobile testing. All HIV-positive persons not on antiretroviral-therapy (ART) were referred to local Ministry of Health and Wellness clinics for treatment. METHODS: Analysis was restricted to the 15 intervention clusters. The proportion of individuals with advanced HIV disease was determined; associations between advanced HIV disease and sex and age explored; and rates of viral suppression determined at 1-year. Mortality and retention in care were compared between CD4 strata (CD4 ≤200 cells/μL vs. > 200 cells/μL). RESULTS: Overall, 17.2% (430/2,499; 95% confidence interval [CI] 15.7-18.8%) of study participants had advanced HIV disease (CD4 ≤200 cells/μL) at time of clinic linkage. Men were significantly more likely to present with CD4 ≤200 cells/μL than women (23.7% versus 13.4%, adjusted odds ratio [aOR] 1.9, 95% CI 1.5-2.3). The risk of advanced HIV disease increased with increasing age (aOR 2.2, 95% CI 1.4-3.2 > 35 years versus < 25 years). Patients with CD4 ≤200 cells/μL had significantly higher rates of attrition from care during follow-up (hazards ratio 1.47, 95% CI 1.1-2.1). CONCLUSIONS: Advanced HIV disease due to late presentation to or disengagement from ART care remains common in the Treat All era in Botswana, calling for innovative testing, linkage, and treatment strategies to engage and retain harder-to-reach populations in care. |
Quality assurance of prevention of mother-to-child transmission of HIV in Botswana
Matambo S , Machakaire E , Motswere-Chirwa C , Legwaila K , Letsholathebe V , Dintwa E , Lu L , Voetsch AC , Glenshaw M . Afr J Midwifery Womens Health 2014 8 (3) 130-133 The HIV prevalence rate among pregnant women is 37% in Botswana. According to UNICEF (2011), maternal and under-5 mortality rates in Botswana were 160 per 100000 live births and 26 per 1000 live births, respectively. Therefore, this study sought to identify the effects of ongoing clinic audits of the prevention of mother-to-child transmission of HIV (PMTCT) in Francistown, Botswana for the period 2008–2012. | Methods: | Existing data for all women attending antenatal and postnatal clinics were collected and collated manually from monthly from clinic PMTCT registers. | Results: | There were 19 720 new antenatal clinic visits between 2008 and 2012 with an HIV prevalence of 35% among the women. Mother-to-child transmission of HIV decreased from 3% in 2008 to 1% in 2012. The decrease was due, in part, to the introduction of triple antiretroviral prophylaxis/antiretroviral therapy (TAP/ARV) (PMTCT Option B) in 2011. | Conclusions: | Audit results over a 5-year period showed a steady improvement in the cascade of PMTCT interventions. Clinic audits should be implemented nationally to reduce maternal and under-5 mortality. |
Monitoring prevention of mother-to-child transmission in Botswana
Legwaila K , Motswere-Chirwa C , Matambo S , Kolobe T , Jimbo W , Keapoletswe K , Letsholathebe V , Lu L . Afr J Midwifery Womens Health 2014 8 (2) 73-75 BACKGROUND: In Botswana, the prevention of mother-to-child transmission (PMTCT) programme has succeeded in reducing rates of transmission of HIV from mother to child since the start of the national antiretroviral (ARV) programme in 2002. METHODS: Data on PMTCT interventions for women who delivered at Nyangabgwe Referral Hospital (NRH), the second largest hospital in Botswana, from 2003 to 2012 were collected from maternity registers. RESULTS: Of 46,354 women, 33% were HIV-positive, 58% were HIV-negative, and 9% were not tested. The percentage of women with a known HIV status increased from 50% in 2003 to 97% in 2012. PMTCT uptake for women on any ARV increased from 61% in 2003 to 86% in 2012. Infants given azidothymidine (AZT) and nevirapine prophylaxis increased from 61% to 85%. CONCLUSIONS: Review of maternity registers demonstrated improvement of multiple PMTCT interventions at NRH. This is a useful approach for monitoring programme quality and guiding strategic planning. |
Follow-up of infants diagnosed with HIV - Early Infant Diagnosis Program, Francistown, Botswana, 2005-2012
Motswere-Chirwa C , Voetsch A , Lu L , Letsholathebe V , Lekone P , Machakaire E , Legwaila K , Matambo S , Maruping M , Kolobe T , Petlo C , Lebelonyane R , Glenshaw M , Dale H , Davis M , Halabi SE , Pelletier A . MMWR Morb Mortal Wkly Rep 2014 63 (7) 158-60 The 2011 prevalence of human immunodeficiency virus (HIV) among pregnant women in Botswana was 30.4%. High coverage rates of HIV testing and antiretroviral prophylaxis have reduced the rate of mother-to-child transmission of HIV in Botswana from as high as 40% with no prophylaxis to <4% in 2011. In June 2005, the national Early Infant Diagnosis (EID) Program began testing HIV-exposed infants (i.e., those born to HIV-infected mothers) for HIV using polymerase chain reaction (PCR) at 6 weeks postpartum. During 2005-2012, follow-up of all HIV-infected infants diagnosed in all 13 postnatal care facilities in Francistown, Botswana, was conducted to ascertain patient outcomes. A total of 202 infants were diagnosed with HIV. As of September 2013, 82 (41%) children were alive and on antiretroviral therapy (ART), 79 (39%) had died, and 41 (20%) were either lost to follow-up, had transferred, or their mothers declined ART. Despite success in preventing mother-to-child transmission in Botswana, results of the EID program highlight the need for early diagnosis of HIV-infected infants, prompt initiation of ART, and retention in care. |
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