Charles Simion Chasela

Prof. Charles Simion Chasela


Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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7 July 2020 in JAIDS Journal of Acquired Immune Deficiency Syndromes
Verified
Journal Article
Closed access
BTBetty B. Tukei
Betty B. Tukei
GFGeoffrey Fatti
Geoffrey Fatti
ATAppolinaire Tiam
Appolinaire Tiam
NNNicoletta Ngorima-Mabhena
Nicoletta Ngorima-Mabhena
VTVincent J. Tukei
Vincent J. Tukei
FHfor EQUIP Health
for EQUIP Health
Background: Lesotho adopted the test-and-treat approach for HIV treatment in June 2016, which increased antiretroviral treatment (ART) clinic volume. We evaluated community-based vs. facility-based differentiated models of multimonth dispensing of ART among stable HIV-infected adults in Lesotho. Methods: Thirty facilities were randomized to 3 arms, facility 3-monthly ART (3MF) (control), community ART groups (3MC), and 6-monthly community distribution points (6MCD). We estimated risk differences (RDs) between arms using population-averaged generalized estimating equations, controlling for baseline imbalances and specifying for clustering. The primary outcome was retention in ART care by intention-to-treat and virologic suppression as a secondary outcome (ClinicalTrials.gov: NCT03438370). Results: A total of 5,336 participants were enrolled, with 1898, 1558, and 1880 in 3MF, 3MC, and 6MCD, respectively. Retention in ART care was not different across arms and achieved the prespecified noninferiority limit (−3.25%) between 3MC vs. 3MF (control); 6MCD vs. 3MF; and 6MCD vs. 3MC, adjusted RD = −0.1% [95% confidence interval (CI): −1.6% to 1.5%], adjusted RD = −1.3% (95% CI: −3.0% to 0.5%), and adjusted RD = −1.2% (95% CI: −2.9% to 0.5%), respectively. After 12 months, 98.6% (n = 1503), 98.1% (n = 1126), and 98.3% (n = 1285) were virally load (VL) suppressed in 3MF, 3MC, and 6MCD, respectively. There were no differences in VL between 3MC vs. control and 6MCD vs. control, risk ratio (RR) = 1.00 (95% CI: 0.98 to 1.01) and RR = 1.00 (95% CI: 0.98 to 1.01), respectively. Conclusions: There were no differences in retention and VL suppression for stable HIV-infected participants receiving multimonth dispensing of ART within community-based differentiated models when compared with the facility-based standard-of-care model.

11 July 2019 in BMC Public Health
Verified
Journal Article
Open access
PDF file
JKJepchirchir Kiplagat
Jepchirchir Kiplagat
AMAnn Mwangi
Ann Mwangi
CCCharles Simion Chasela
Charles Simion Chasela
SHSusann Huschke
Susann Huschke
While younger adults (15–49 years) form the majority of the population living with HIV, older adults (≥50 years) infected with HIV face multiple challenges related to the aging process and HIV. We explored the experiences of older persons infected with HIV at the Academic Model Providing Access to Healthcare (AMPATH) program in western Kenya to understand the challenges faced when seeking HIV care services. Between November 2016 and April 2017, a total of 57 adults aged 50 years and above were recruited from two AMPATH facilities – one rural and one urban facility. A total of 25 in-depth interviews and four focus group discussions were conducted, audio-recorded, transcribed and thematic analysis performed. Study participants raised unique challenges with seeking HIV care that include visits to multiple healthcare providers to manage HIV and comorbidities and as a result impact on their adherence to medication and clinical visits. Challenges with inadequate quality of facilities and poor patient-provider communication were also raised. Participants’ preference for matched gender and older age for care providers that serve older patients were identified. Results indicate multiple challenges faced by older adults that need attention in ensuring continuous engagement in HIV care. Targeted HIV care for older adults would, therefore, significantly improve their access to and experience of HIV care. Of key importance is the integration of other chronic diseases into HIV care and employing staff that matches the needs of older adults.

1 May 2019 in Clinical Epidemiology
Verified
Journal Article
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MMMouhamed Abdou Salam Mbengue
Mouhamed Abdou Salam Mbengue
CCCharles Simion Chasela
Charles Simion Chasela
Dorina OnoyaDorina Onoya
Dorina Onoya
SMSouleymane Mboup
Souleymane Mboup
MFMatthew P Fox
Matthew P Fox
Denise H. EvansDenise H. Evans
Denise H. Evans
Clinical predictor score to identify patients at risk of poor viral load suppression at six months on antiretroviral therapy: results from a prospective cohort study in Johannesburg, South Africa Mouhamed Abdou Salam Mbengue,1,2 Charles Chasela,1,3 Dorina Onoya,4 Souleymane Mboup,2 Matthew P Fox,5,6 Denise Evans41Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; 2Department of Biostatistics and Health Economics, IRESSEF: Institute of Health Research, Epidemiologic Surveillance and Training, Dakar, Senegal; 3Epidemiology and Strategic Information, HIV/AIDS, STIs & TB, Human Sciences Research Council, Pretoria, South Africa; 4Health Economics and Epidemiology Research Office, Department of Internal Medicine, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; 5Department of Global Health, Boston University School of Public Health, Boston, MA, USA; 6Department of Epidemiology, Boston University School of Public Health, Boston, MA, USAPurpose: As countries work toward 90:90:90 targets, early identification of patients with inadequate response to antiretroviral therapy (ART) is critical for achieving optimal HIV treatment outcomes. We developed and evaluated a clinical prediction score (CPS) to identify HIV-positive patients at risk of poor viral load suppression at 6 months on ART.Patients and methods: We conducted a prospective cohort study of HIV-positive ART naïve adults (≥18 years) initiating standard first-line ART between February 2012 and April 2014 at Themba Lethu Clinic in Johannesburg, South Africa. We used Modified Poisson regression to estimate the association between patient characteristics and poor viral load suppression, defined as a viral load ≥400 copies/mL at 6 months on ART. We developed a CPS following the Spiegel Halter and Knill-Jones approach and determined the diagnostic accuracy compared to viral load as the “gold standard”. We identified the optimal cutoff at which the CPS would identify those at risk of poor viral load suppression.Results: Among 353 patients, 67.7% had a viral load measurement at 6 months on ART and 30.1% of these were viremic (≥400 copies/mL). Male gender, platelet count 3 ≥7 days late for ≥2 ARV visits, visual analog scale (VAS)

23 September 2022 in PLOS ONE
Verified
Journal Article
Open access
PDF file
KMKhumbulani Moyo
Khumbulani Moyo
NINelson Igaba
Nelson Igaba
Constance Wose KingeConstance Wose Kinge
Constance Wose Kinge
CCCharles Simion Chasela
Charles Simion Chasela
MPMotshana Phohole
Motshana Phohole
ISIan Sanne
Ian Sanne
Introduction: Voluntary medical male circumcision (VMMC) remains an effective biomedical intervention for HIV prevention in high HIV prevalence countries. In South Africa, United States Agency for International Development VMMC partners provide technical assistance to the Department of Health, at national and provincial levels in support of the establishment of VMMC sites as well as in providing direct VMMC services at site level since April 2012. We describe the outcomes of the Right to Care (RTC) VMMC program implemented in South Africa from 2012 to 2017. Methods: This retrospective study was undertaken at RTC supported facilities across six provinces. Young males aged ≥10 years who presented at these facilities from 1 July 2012 to 31 September 2017 were included. Outcomes were VMMC uptake, HIV testing uptake and rate of adverse events (AEs). Using a de-identified observational database of these clients, summary statistics of the demographic characteristics and outcomes were calculated. Results: There were a total 1,001,226 attendees of which 998,213 (99.7%) were offered VMMC and had a median age of 15 years (IQR = 12–23 years). Of those offered VMMC, 99.6% (994,293) consented, 96.7% (965,370) were circumcised and the majority (46.3%) were from Gauteng province. HIV testing uptake was 71% with a refusal rate of 15%. Of the newly diagnosed HIV positives, 64% (6,371 / 9,972) referrals were made. The rate of AEs, defined as bleeding, infection, and insufficient skin removal) declined from 3.26% in 2012 to 1.17% in 2017. There was a reduction in infection-related AEs from 2,448 of the 2,602 adverse events (94.08%) in 2012 to 129 of the 2,069 adverse events (6.23%) in 2017. Conclusion: There was a high VMMC uptake with a decline in AEs over time. Adolescent men contributed the most to the circumcised population, an indication that the young population accesses medical circumcision more. VMMC programs need to implement innovative demand creation strategies to encourage older males (20–34 years) at higher risk of HIV acquisition to get circumcised for immediate impact in reduction of HIV incidence. HIV prevalence in the total population increased with increasing age, notably in clients above 25 years.

16 September 2020 in Journal of Viral Hepatitis
Verified
Journal Article
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YTYin Min Thaung
Yin Min Thaung
CCCharles Simion Chasela
Charles Simion Chasela
KCKara W. Chew
Kara W. Chew
TMThomas Minior
Thomas Minior
ALAye Aye Lwin
Aye Aye Lwin
FHfor EQUIP Health
for EQUIP Health
Access to hepatitis C virus (HCV) testing and treatment is limited in Myanmar. We assessed an integrated HIV and viral hepatitis testing and HCV treatment strategy. Sofosbuvir/velpatasvir (SOF/VEL) +/‐ weight‐based ribavirin for 12 weeks was provided at three treatment sites in Myanmar and sustained virologic response (SVR) assessed at 12 weeks after treatment. Participants co‐infected with HBV were treated concurrently with tenofovir. Cost estimates in 2018 USD were made at Yangon and Mandalay using standard micro‐costing methods. 803 participants initiated SOF/VEL; 4.8% were lost to follow‐up. SVR was achieved in 680/803 (84.6%) by intention‐to‐treat analysis. SVR amongst people who inject drugs (PWID) was 79.7% (381/497), but 92.5% among PWID on opioid substitution therapy (OST) (74/80), and 97.4% among non‐PWID (298/306). Utilizing data from 492 participants, of whom 93% achieved SVR, the estimated average cost of treatment per patient initiated was $1030 (of which 54% were medication costs), with a production cost per successful outcome (SVR) of $1109 and real‐world estimate of $1250. High SVR rates were achieved for non‐PWID and PWID on OST. However, the estimated average cost of the intervention (under the assumption of no genotype testing and reduced real‐world effectiveness) of $1250/patient is unaffordable for a national elimination strategy. Reductions in the cost of antivirals and linkage to social and behavioral health services including substance use disorder treatment to increase retention and adherence to treament are critical to HCV elimination in this population.

22 December 2020 in AAS Open Research
Verified
Journal Article
Open access
PDF file
Tobias ChirwaTobias Chirwa
Tobias Chirwa
ZZZvifadzo Matsena Zingoni
Zvifadzo Matsena Zingoni
PMPascalia Munyewende
Pascalia Munyewende
Samuel MandaSamuel Manda
Samuel Manda
HMHenry Mwambi
Henry Mwambi
JTJim Todd
Jim Todd
The increase in health research in sub-Saharan Africa (SSA) has led to a high demand for biostatisticians to develop study designs, contribute and apply statistical methods in data analyses. Initiatives exist to address the dearth in statistical capacity and lack of local biostatisticians in SSA health projects. The Sub-Saharan African Consortium for Advanced Biostatistics (SSACAB) led by African institutions was initiated to improve biostatistical capacity according to the needs identified by African institutions, through collaborative masters and doctoral training in biostatistics. SACCAB has created a critical mass of biostatisticians and a network of institutions over the last five years and has strengthened biostatistics resources and capacity for health research studies in SSA. SSACAB comprises 11 universities and four research institutions which are supported by four European universities. In 2015, only four universities had established Masters programmes in biostatistics and SSACAB supported the remaining seven to develop Masters programmes. In 2019 the University of the Witwatersrand became the first African institution to gain Royal Statistical Society accreditation for a Biostatistics Masters programme. A total of 150 fellows have been awarded scholarships to date of which 123 are Masters fellowships (41 female) of whom 58 have already graduated. Graduates have been employed in African academic (19) and research (15) institutions and 10 have enrolled for PhD studies. A total of 27 (10 female) PhD fellowships have been awarded; 4 of them are due to graduate by 2020. To date, SSACAB Masters and PhD students have published 17 and 31 peer-reviewed articles, respectively. SSACAB has also facilitated well-attended conferences, face-to-face and online short courses. Pooling of limited biostatistics resources in SSA combined with co-funding from external partners has shown to be an effective strategy for the development and teaching of advanced biostatistics methods, supervision and mentoring of PhD candidates.