🏆 Finalist — NIH Data Sharing Index (“S-Index”) Challenge

Alexa Heekes

Western Cape Department of Health

ORCID: 0000-0003-2430-5194

Also affiliated with University of Cape Town

MedicineHealth ProfessionsImmunology and Microbiology

Pilot corpus only

This score is computed over theSindex pilot corpus and does not cover the full scientific literature. Scores are relative to papers we have ingested — papers, authors, and institutions outside the pilot are not represented. Methodology.

Top 3%percentile
1.5Author DataRank

Indexed papers

5in pilot corpus
datarank_citation_only_1hop_v6· scope data_onlyMethodology
Why this DataRank?

An author's DataRank is the sum of the DataRanks of all 5 indexed papers attributed to them. A prolific author with many moderate-impact papers can outrank one with a single high-impact paper.

Author scores recompute whenever paper DataRanks are refreshed, so this number lags the underlying paper scores by at most one batch run.

Read the full methodology →

Top data-sharing exemplar

The highest-impact dataset this researcher has shared, ranked by DataRank — the single contribution doing the most to lift their data-sharing standing.

Maternal and birth outcomes in pregnant people with and without HIV in the Western Cape, South Africa

AIDS(2023)10.1097/qad.0000000000003728
Top 32%
0.617DataRank
Top 32%15 citations

Andisiwe Bovu, Shani T. de Beer, Florence Phelanyane, Paige L. Williams, Alexa Heekes +9 more

Papers

Driven by 26 papers — median percentile 33. Top paper: “Risk Factors for Coronavirus Disease 2019 (COVID-19) Death in a Population Cohort Study from the Western Cape Province, South Africa”.

Risk Factors for Coronavirus Disease 2019 (COVID-19) Death in a Population Cohort Study from the Western Cape Province, South Africa

Clinical Infectious Diseases(2020)10.1093/cid/ciaa1198
N/A
0.960DataRank · unranked
599 citations

Mary‐Ann Davies, Hannah Hussey, Muzzammil Ismail, Erna Morden, Ziyanda Vundle +95 more

Maternal and birth outcomes in pregnant people with and without HIV in the Western Cape, South Africa

AIDS(2023)10.1097/qad.0000000000003728
Top 32%
0.617DataRank
Top 32%15 citations

Andisiwe Bovu, Shani T. de Beer, Florence Phelanyane, Paige L. Williams, Alexa Heekes +9 more

Assessing the clinical severity of the Omicron variant in the Western Cape Province, South Africa, using the diagnostic PCR proxy marker of RdRp target delay to distinguish between Omicron and Delta infections – a survival analysis

International Journal of Infectious Diseases(2022)10.1016/j.ijid.2022.02.051
N/A
0.489DataRank · unranked
25 citations

Mary‐Ann Davies, Alexa Heekes, Carolyn Williamson, Ziyaad Valley‐Omar, Diana Hardie +21 more

Cohort profile: the Western Cape Pregnancy Exposure Registry (WCPER)

BMJ Open(2022)10.1136/bmjopen-2021-060205
Top 41%
0.460DataRank
Top 41%14 citations

Alexa Heekes, Amy L. Slogrove, Florence Phelanyane, Mary‐Ann Davies, Landon Myer +12 more

Lower respiratory tract infection admissions and deaths among children under 5 years in public sector facilities in the Western Cape Province, South Africa, before and during the COVID-19 pandemic (2019 - 2021)

South African Medical Journal(2024)10.7196/samj.2024.v114i3.1560
N/A
0.208DataRank · unranked
3 citations

Erna Morden, Nesbert Zinyakatira, Alexa Heekes, Hayley E. Jones, S R Walter +6 more

High Incidence of Tuberculosis in Young Children Living With HIV in the Western Cape, South Africa

JAIDS Journal of Acquired Immune Deficiency Syndromes(2025)10.1097/qai.0000000000003591
Top 67%
0.171DataRank
Top 67%2 citations

Helena Rabie, Brian Eley, Lisa Frigati, James Nuttall, Emma Kalk +6 more

Population‐based prevalence of congenital defects in a routine sentinel site‐based surveillance system in the Western Cape, South Africa

Birth Defects Research(2024)10.1002/bdr2.2388
Top 70%
0.165DataRank
Top 70%2 citations

Alexa Heekes, Diane Lavies, Lizel Jacobs, Careni Spencer, Alison Boutall +8 more

The Retrospective Implementation of Standardized In Utero HIV Exposure Definitions Using Routinely Collected Public Sector Data Across the Western Cape Province, South Africa

The Pediatric Infectious Disease Journal(2024)10.1097/inf.0000000000004486
Top 78%
0.104DataRank
Top 78%1 citations

Mary‐Ann Davies, Florence Phelanyane, Hayley E. Jones, Suzanne M Ingle, Brian Eley +7 more

Prevention of vertical transmission of HIV in Khayelitsha, South Africa: A contemporary review of services after 20 years

South African Medical Journal(2023)10.7196/samj.2023.v113i10.861
N/A
0DataRank · unranked
15 citations

Alexa Heekes, Mariette Smith, Karen Jennings, Vanessa Mudaly, Pauline Pieters +6 more

Record linkage for Routinely Collected Health Data in an African Health Information Exchange

International Journal for Population Data Science(2023)10.23889/ijpds.v8i1.1771
N/A
0DataRank · unranked
7 citations

Alexa Heekes, Mariette Smith, Andrew Boulle, Nicki Tiffin, Themba Mutemaringa

The cyclical cascade of HIV care: Temporal care engagement trends within a population-wide cohort

PLoS Medicine(2024)10.1371/journal.pmed.1004407
N/A
0DataRank · unranked
23 citations

Venessa Timmerman, Claire Keene, Florence Phelanyane, Alexa Heekes, Brian Rice +4 more

Factors associated with vertical transmission of HIV in the Western Cape, South Africa: a retrospective cohort analysis

Journal of the International AIDS Society(2024)10.1002/jia2.26235
N/A
0DataRank · unranked
13 citations

Emma Kalk, Alexa Heekes, Florence Phelanyane, Nisha Jacob, Andrew Boulle +7 more

SARS-CoV-2 seroepidemiology in Cape Town, South Africa, and implications for future outbreaks in low-income communities

PLOS Global Public Health(2024)10.1371/journal.pgph.0003554
N/A
0DataRank · unranked
1 citations

Helena Vreede, Mary‐Ann Davies, Alexa Heekes, Emma Kalk, Diana Hardie +19 more

COVID-19 Vaccine Uptake and Effectiveness by Time since Vaccination in the Western Cape Province, South Africa: An Observational Cohort Study during 2020–2022

Vaccines(2024)10.3390/vaccines12060628
N/A
0DataRank · unranked
4 citations

Mary‐Ann Davies, Alexa Heekes, Hassan Mahomed, Anthony Hawkridge, Erna Morden +15 more

Exploring the validity of routine individuated service data for antenatal HIV surveillance in the Western Cape

Research Square(2024)10.21203/rs.3.rs-4065819/v1
N/A
0DataRank · unranked
0 citations

Brian Rice, Alexa Heekes, Leigh F. Johnson, Samantha Brinkmann, Tendesayi Kufa +3 more

Exploring the validity of routine individuated service data for antenatal HIV surveillance in the Western Cape

BMC Infectious Diseases(2025)10.1186/s12879-025-10639-6
N/A
0DataRank · unranked
1 citations

Brian Rice, Alexa Heekes, Leigh F. Johnson, Samantha Brinkmann, Tendesayi Kufa +3 more

Mother‐child dyads living with HIV in the Western Cape, South Africa: Undetectable = Undetectable?

Journal of the International AIDS Society(2025)10.1002/jia2.26418
N/A
0DataRank · unranked
1 citations

Helena Rabie, Brian Eley, Lisa Frigati, James Nuttall, Emma Kalk +8 more

Diarrhoeal admissions among children aged <5 years in public sector facilities in Western Cape Province, South Africa, before and during the COVID-19 pandemic (2019 - 2021)

South African Medical Journal(2025)10.7196/samj.2025.v115i7.2726
N/A
0DataRank · unranked
0 citations

Erna Morden, Nesbert Zinyakatira, Alexa Heekes, Hayley E. Jones, S R Walter +7 more

Infectious-cause hospitalisation in a province-wide cohort of children with antenatal HIV exposure compared to children without HIV exposure

AIDS(2025)10.1097/qad.0000000000004423
N/A
0DataRank · unranked
0 citations

Florence Phelanyane, Suzanne M Ingle, Amy L. Slogrove, Brian Eley, Emma Kalk +6 more

Utility of digitising point of care HIV test results to accurately measure, and improve performance towards, the UNAIDS 90-90-90 targets

PLoS ONE(2020)10.1371/journal.pone.0235471
N/A
0DataRank · unranked
31 citations

Brian Rice, Emma Kalk, Alexa Heekes, Jennie Morgan, James Hargreaves +2 more

Consolidating strategic information to monitor progress against the UNAIDS 90–90–90 targets: evaluating the operational feasibility of an electronic HIV testing register in Cape Town, South Africa

BMC Health Services Research(2020)10.1186/s12913-020-05517-7
N/A
0DataRank · unranked
4 citations

Brian Rice, Emma Kalk, Alexa Heekes, Jennie Morgan, Samantha Brinkmann +4 more

Consolidating strategic information to monitor progress against the UNAIDS 90-90-90 targets: evaluating the operational feasibility of an electronic HIV testing register in Cape Town, South Africa

Research Square(2020)10.21203/rs.3.rs-23068/v2
N/A
0DataRank · unranked
0 citations

Brian Rice, Emma Kalk, Alexa Heekes, Jennie Morgan, Samantha Brinkmann +4 more

Consolidating strategic information to monitor progress against the UNAIDS 90-90-90 targets: evaluating the operational feasibility of an electronic HIV testing register in Cape Town, South Africa

Research Square(2020)10.21203/rs.3.rs-23068/v3
N/A
0DataRank · unranked
0 citations

Brian Rice, Emma Kalk, Alexa Heekes, Jennie Morgan, Samantha Brinkmann +4 more

Consolidating Strategic Information to Monitor Progress Against the UNAIDS 90-90-90 Targets: Evaluating the Operational Feasibility of an Electronic HIV Testing Register in Cape Town, South Africa

Research Square(2020)10.21203/rs.3.rs-23068/v1
N/A
0DataRank · unranked
0 citations

Brian Rice, Emma Kalk, Alexa Heekes, Jennie Morgan, Samantha Brinkmann +4 more

Epidemiology and outcomes of SARS-CoV-2 infection associated with anti-nucleocapsid seropositivity in Cape Town, South Africa

medRxiv(2022)10.1101/2022.12.01.22282927
N/A
0DataRank · unranked
5 citations

Helena Vreede, Mary‐Ann Davies, Alexa Heekes, Emma Kalk, Diana Hardie +20 more

Assessing the clinical severity of the Omicron variant in the Western Cape Province, South Africa, using the diagnostic PCR proxy marker of RdRp target delay to distinguish between Omicron and Delta infections – a survival analysis

medRxiv(2022)10.1101/2022.01.13.22269211
N/A
0DataRank · unranked
3 citations

Mary‐Ann Davies, Alexa Heekes, Carolyn Williamson, Ziyaad Valley‐Omar, Diana Hardie +22 more