I am a medically trained public health scientist interested in the epidemiology of vaccine-preventable diseases. My PhD research examined the immunogenicity, reactogenicity, and IgE-mediated immune responses of a mixed whole-cell and acellular pertussis vaccine schedule in Australian infants. Based in Perth, I contributed to studies on maternal RSV and pertussis vaccines, the off-target effects of BCG, and causal models for long COVID and catheter-associated bloodstream infections. I currently conduct large-scale epidemiological studies using linked data to explore missed opportunities for HPV vaccination and to assess inequities in HIV treatment access, alongside community-based organisations including the National Association of People with HIV Australia (NAPWHA). Previously, I held an academic position in Medical Parasitology in Venezuela, where I conducted research that informed WHO guidelines on the public health control of strongyloidiasis. I am committed to advancing methodologies in epidemiological analysis to optimise vaccination strategies and disease prevention. I work in R daily, continuously expanding my skills; my favourite libraries belong to the core tidyverse.
Epidemiologist
Dr Gladymar Perez Chacon
MBBS, DTM&H, PhD
Publications
Journal articles
Pérez Chacón G; McAlister S; Totterdell J; Estcourt MJ; Marsh JA; Jones M; Perrett KP; Campbell DE; Wood N; Gold M; Waddington CS; O'Sullivan M; Curtis N; Wadia U; McIntyre PB; Holt PG; Snelling T; Richmond PC, 2025, 'Immune impacts of infant whole-cell and acellular pertussis vaccination on co-administered vaccines', Journal of Infection, 91, http://dx.doi.org/10.1016/j.jinf.2025.106515
2025
Messina NL; Germano S; McElroy R; Bonnici R; Grubor-Bauk B; Lynn DJ; McDonald E; Nicholson S; Perrett KP; Pittet LF; Rudraraju R; Stevens NE; Subbarao K; Curtis N; Davidson A; Gardiner K; Gwee A; Jamieson T; Morawakage T; Perlen S; Sastry A; Teo JW; Orsini F; Lee K; Moore C; Vidmar S; Ali R; Dunn R; Edler P; Gell G; Goodall C; Hall R; Krastev A; La N; McPhate N; Nguyen T; Ren J; Stevens L; Alamrousi A; Dang T; Hua J; Razmovska M; Reddiex S; Wang X; Anderson J; Azzopardi K; Bennett-Wood V; Czajko A; Mazarakis N; McCafferty C; Oppedisano F; Ortika B; Pell C; Spry L; Toh R; Velagapudi S; Vlahos A; Wee-Hee A; Ramos P; De La Cruz K; Gamage D; Karunanayake A; Mezzetti I; Ong B; Singh R; Sooriyarachchi E; Cain N; Brizuela R; Huang H; Abruzzo V; Bealing M; Bimboese P; Bowes K; Burrell E; Chan J; Cushnahan J; Elborough H; Elkington O; Fahey K; Fernandez M; Flynn C; Fowler S; Andrit MG; Gladanac B; Hammond C; Ma N; Macalister S; Milojevic E; Mojeed J; Nguyen J; O'Donnell L; Olivier N; Ooi I; Reynolds S; Shen L; Sherry B; Spotswood J; Wedderburn J; Younes A, 2024, 'Specific and off-target immune responses following COVID-19 vaccination with ChAdOx1-S and BNT162b2 vaccines—an exploratory sub-study of the BRACE trial', Ebiomedicine, 103, http://dx.doi.org/10.1016/j.ebiom.2024.105100
2024
Pérez Chacón G; Fathima P; Jones M; Estcourt MJ; Gidding HF; Moore HC; Richmond PC; Snelling T, 2024, 'Infant Whole-Cell Versus Acellular Pertussis Vaccination in 1997 to 1999 and Risk of Childhood Hospitalization for Food-Induced Anaphylaxis: Linked Administrative Databases Cohort Study', Journal of Allergy and Clinical Immunology in Practice, 12, pp. 670 - 680, http://dx.doi.org/10.1016/j.jaip.2023.12.048
2024
Pérez Chacón G; Saha A; Phillips E; Guy R; Applegate TL; Causer L; Mcgregor S; Hengel B, 2024, 'Syphilis point-of-care tests: an Australian perspective', Microbiology Australia, 45, pp. 127 - 131, http://dx.doi.org/10.1071/MA24036
2024
Chacón GP; Estcourt MJ; Totterdell J; Marsh JA; Perrett KP; Campbell DE; Wood N; Gold M; Waddington CS; Sullivan MO; McAlister S; Curtis N; Jones M; McIntyre PB; Holt PG; Richmond PC; Snelling T, 2024, 'Immunogenicity, reactogenicity, and IgE-mediated immune responses of a mixed whole-cell and acellular pertussis vaccine schedule in Australian infants: A randomised, double-blind, noninferiority trial', Plos Medicine, 21, http://dx.doi.org/10.1371/journal.pmed.1004414
2024
Pittet LF; Messina NL; McDonald E; Orsini F; Barry S; Bonten M; Campbell J; Croda J; Croda MG; Dalcolmo M; Gardiner K; Gwee A; Jardim B; Lacerda MVG; Lucas M; Lynn DJ; Manning L; Perrett KP; Post JJ; Prat-Aymerich C; Richmond PC; Rocha JL; Rodriguez-Baño J; Warris A; Wood NJ; Davidson A; Curtis N; Jamieson T; Morawakage T; Perlen S; Sastry A; Teo JW; Lee K; Moore C; Vidmar S; Ali R; Dunn R; Edler P; Gell G; Goodall C; Hall R; Krastev A; La N; McPhate N; Nguyen T; Ren J; Stevens L; Alamrousi A; Bonnici R; Dang T; Germano S; Hua J; McElroy R; Razmovska M; Reddiex S; Wang X; Anderson J; Azzopardi K; Bennett-Wood V; Czajko A; Mazarakis N; McCafferty C; Oppedisano F; Ortika B; Pell C; Spry L; Toh R; Velagapudi S; Vlahos A; Wee-Hee A; Ramos P; De La Cruz K; Gamage D; Karunanayake A; Mezzetti I; Ong B; Singh R; Sooriyarachchi E; Nicholson S; Cain N; Brizuela R; Huang H; Abruzzo V; Bealing M; Bimboese P; Bowes K; Burrell E; Chan J; Cushnahan J; Elborough H; Elkington O; Fahey K; Fernandez M; Flynn C; Fowler S; Andrit MG; Gladanac B; Hammond C; Ma N, 2024, 'Bacille Calmette-Guérin vaccination to prevent febrile and respiratory illness in adults (BRACE): secondary outcomes of a randomised controlled phase 3 trial', Eclinicalmedicine, 72, http://dx.doi.org/10.1016/j.eclinm.2024.102616
2024
Pittet LF; Moore CL; McDonald E; Barry S; Bonten M; Campbell J; Croda J; Dalcolmo M; Davidson A; Douglas MW; Gardiner K; Gwee A; Jardim B; Lacerda MVG; Lucas M; Lynn DJ; Manning L; de Oliveira RD; Perrett KP; Prat-Aymerich C; Richmond PC; Rocha JL; Rodriguez-Baño J; Warris A; Wood NJ; Messina NL; Curtis N; Jamieson T; Morawakage T; Perlen S; Sastry A; Teo JW; Orsini F; Lee K; Vidmar S; Ali R; Dunn R; Edler P; Gell G; Goodall C; Hall R; Krastev A; La N; McPhate N; Nguyen T; Ren J; Stevens L; Alamrousi A; Bonnici R; Dang T; Germano S; Hua J; McElroy R; Razmovska M; Reddiex S; Wang X; Anderson J; Azzopardi K; Bennett-Wood V; Czajko A; Mazarakis N; McCafferty C; Oppedisano F; Ortika B; Pell C; Spry L; Toh R; Velagapudi S; Vlahos A; Wee-Hee A; Ramos P; De La Cruz K; Gamage D; Karunanayake A; Mezzetti I; Ong B; Singh R; Sooriyarachchi E; Nicholson S; Cain N; Brizuela R; Huang H; Abruzzo V; Bealing M; Bimboese P; Bowes K; Burrell E; Chan J; Cushnahan J; Elborough H; Elkington O; Fahey K; Fernandez M; Flynn C; Fowler S; Andrit MG; Gladanac B; Hammond C, 2023, 'Bacillus Calmette-Guérin vaccination for protection against recurrent herpes labialis: a nested randomised controlled trial', Eclinicalmedicine, 64, http://dx.doi.org/10.1016/j.eclinm.2023.102203
2023
Mascaro S; Wu Y; Woodberry O; Nyberg EP; Pearson R; Ramsay JA; Mace AO; Foley DA; Snelling TL; Nicholson AE; Semprini A; Martin A; McLean-Tooke A; Marais B; Tang B; McLeod C; Blyth CC; Lemoh C; Waddington C; Nolan D; Raby E; Perez G; Marks G; Denholm J; Pilgram L; Anstey N; Plebanski M; Boyd M; Borland ML; Maze M; John M; Middleton P; Craig S; Tong SYC; Benson S; Richards T, 2023, 'Modeling COVID-19 disease processes by remote elicitation of causal Bayesian networks from medical experts', BMC Medical Research Methodology, 23, http://dx.doi.org/10.1186/s12874-023-01856-1
2023
Chacón GP; Fathima P; Jones M; Estcourt MJ; Gidding HF; Moore HC; Richmond PC; Snelling T, 2023, 'Association between pertussis vaccination in infancy and childhood asthma: A population-based record linkage cohort study', Plos One, 18, http://dx.doi.org/10.1371/journal.pone.0291483
2023
Messina NL; Germano S; McElroy R; Rudraraju R; Bonnici R; Pittet LF; Neeland MR; Nicholson S; Subbarao K; Curtis N; Baena AS; Teo JW; de Lima GT; Abreu C; Abruzzo V; Addlem L; Agius S; Barbosa AAR; Alamrousi A; da Silva dos Santos AA; Al-Hindawi Y; Silveira SAD; da Cruz LA; Anderson J; Nelly A; Anthony C; dos Reis Pereira AASDA; de las Revillas Almajano FA; Arnold A; Arrowsmith B; Azzopardi K; Marti CB; Bahaduri T; Bannister S; Barney S; Barrera L; Barriocanal A; Barros D; Barry S; Bartlett A; Batista L; Muranaka S; Baulman T; Bealing M; Beardsley J; Gutierrez ABM; Bell J; Benson S; Rym B; Bennett-Wood V; Bergant N; Barbosa FB; Bijllaardt W; Bimboese P; de Andrade CB; Blake S; Blauwendraat K; Boersma W; Garcia PB; Bonten M; Boon A; Bourke A; Bowes K; Brasil L; Brophy C; Botten R; Buchanan S; Bucholc J; Burns A; Burrell E; Bustos N; Byrne B; Byrne A; Calbo E; Montes JC; Camesella B; Campbell J; Cangas A; Carlin J; Roque MC; Diogo RCP; Carvalho E; Casas I; Castro E; Castro R; Catterick H; Escobar RCD; Chan J; Cheah J; Chern TY; Chengodu T; Ciaverella M; Clark S; Espindola MAC; Cobbledick A; Colaco C; Collopy S; Comella P; Corbett M; Castro GCE; Palasanthiran P; McMullan B; Perez Chacon G, 2022, 'Off-target effects of bacillus Calmette–Guérin vaccination on immune responses to SARS-CoV-2: implications for protection against severe COVID-19', Clinical and Translational Immunology, 11, pp. e1387, http://dx.doi.org/10.1002/cti2.1387
2022
Totterdell JA; Chacon GP; Estcourt MJ; Jones M; Richmond P; Snelling TL; Marsh JA, 2022, 'Statistical analysis plan for the OPTIMUM study: optimising immunisation using mixed schedules, an adaptive randomised controlled trial of a mixed whole-cell/acellular pertussis vaccine schedule', Trials, 23, http://dx.doi.org/10.1186/s13063-021-05874-6
2022
Pittet LF; Messina NL; Gardiner K; Orsini F; Abruzzo V; Bannister S; Bonten M; Campbell JL; Croda J; Dalcolmo M; Elia S; Germano S; Goodall C; Gwee A; Jamieson T; Jardim B; Kollmann TR; Lacerda MVG; Lee KJ; Legge D; Lucas M; Lynn DJ; McDonald E; Manning L; Munns CF; Perrett KP; Prat Aymerich C; Richmond P; Shann F; Sudbury E; Villanueva P; Wood NJ; Lieschke K; Subbarao K; Davidson A; Curtis N; Abreu C; Addlem L; Agius S; Barbosa AAR; Alamrousi A; da Silva dos Santos AA; Al-Hindawi Y; Da Silveira SA; da Cruz LA; Anderson J; Anthony C; de Almeida dos Reis Pereira AAS; de las Revillas Almajano FA; Arnold A; Arrowsmith B; Azzopardi K; Marti CB; Bahaduri T; Barney S; Barrera L; Barriocanal A; Barros D; Bartlett A; Muranaka LBS; Baulman T; Bealing M; Beardsley J; Gutierrez ABM; Bell J; Bennett-Wood V; Bergant N; Barbosa FB; Bijllaardt W; Bimboese P; de Andrade CB; Blauwendraat K; Boersma W; Garcia PB; Bonnici R; Boon A; Bourke A; Bowes K; Brasil L; Brophy C; Buchanan S; Bucholc J; Burns A; Burrell E; Bustos N; Byrne B; Byrne A; Calbo E; Montes JC; Camesella B; Campbell J; Cangas A; Carlin J; Roque MC; Diogo RCP; Carvalho E; Casas I; Castro E; Castro R; Catterick H, 2021, 'BCG vaccination to reduce the impact of COVID-19 in healthcare workers: Protocol for a randomised controlled trial (BRACE trial)', BMJ Open, 11, http://dx.doi.org/10.1136/bmjopen-2021-052101
2021
Chacón GP; Fathima P; Jones M; Barnes R; Richmond PC; Gidding HF; Moore HC; Snelling TL, 2021, 'Pertussis immunisation in infancy and atopic outcomes: A protocol for a population-based cohort study using linked administrative data', Plos One, 16, http://dx.doi.org/10.1371/journal.pone.0260388
2021
Perez Chacon G; Ramsay J; Brennan-Jones CG; Estcourt MJ; Richmond P; Holt P; Snelling T, 2021, 'Whole-cell pertussis vaccine in early infancy for the prevention of allergy in children', Cochrane Database of Systematic Reviews, 2021, http://dx.doi.org/10.1002/14651858.CD013682.pub2
2021
Perez Chacon G; Estcourt M; Ramsay J; Brennan-Jones CG; Richmond P; Holt P; Snelling T, 2020, 'Whole-cell pertussis vaccine in early infancy for the prevention of allergy', Cochrane Database of Systematic Reviews, 2020, http://dx.doi.org/10.1002/14651858.CD013682
2020
Perez Chacon G; Estcourt MJ; Totterdell J; Campbell DE; Perrett KP; Marsh JA; Richmond PC; Wood N; Gold MS; Holt PG; Waddington CS; Snelling TL, 2020, 'OPTIMUM study protocol: An adaptive randomised controlled trial of a mixed whole-cell/acellular pertussis vaccine schedule', BMJ Open, 10, http://dx.doi.org/10.1136/bmjopen-2020-042838
2020
Pocaterra LA; Ferrara G; Peñaranda R; Rojas E; Pérez-Chacón G; Hernán A; Certad G; Goldstein C; Núñez L, 2017, 'Improved detection of strongyloides stercoralis in modified agar plate cultures', American Journal of Tropical Medicine and Hygiene, 96, pp. 863 - 865, http://dx.doi.org/10.4269/ajtmh.16-0414
2017
de Noya BA; Pérez-Chacón G; Díaz-Bello Z; Dickson S; Muñoz-Calderón A; Hernández C; Pérez Y; Mauriello L; Moronta E, 2017, 'Description of an oral chagas disease outbreak in Venezuela, including a vertically transmitted case', Memorias do Instituto Oswaldo Cruz, 112, pp. 569 - 571, http://dx.doi.org/10.1590/0074-02760170009
2017
Pérez-Chacón G; Pocaterra LA; Rojas E; Hernán A; Jiménez JC; Núñez L, 2017, 'Case report: Coinfection with hymenolepis nana, hymenolepis diminuta, giardia intestinalis, and human immunodeficiency virus: A case report with complex immunologic interactions', American Journal of Tropical Medicine and Hygiene, 96, pp. 1094 - 1096, http://dx.doi.org/10.4269/ajtmh.16-0413
2017
Wagner C; Reyes-Batlle M; Hernán A; Rojas E; Pérez G; López-Arencibia A; Sifaoui I; Martínez-Carretero E; Piñero JE; Valladares B; Lorenzo-Morales J, 2016, 'High occurrence of acanthamoeba genotype T4 in soil sources from Bolívar State, Venezuela', Acta Parasitologica, 61, pp. 466 - 470, http://dx.doi.org/10.1515/ap-2016-0063
2016
Preprints
Pérez Chacón G; McAlister S; Totterdell J; Estcourt MJ; Marsh JA; Jones M; Perrett KP; Campbell DE; Wood N; Gold M; Waddington CS; O’Sullivan M; Curtis N; Wadia U; McIntyre PB; Holt PG; Snelling T; Richmond PC, 2025, Immunogenicity of co-administered vaccine antigens with whole-cell or acellular pertussis vaccines in infancy: a randomised controlled trial, http://dx.doi.org/10.1101/2025.02.16.25321528
2025
Pérez Chacón G; Mascaro S; Estcourt MJ; Phetsouphanh C; Nicholson AE; Snelling T; Wu Y, 2024, Modelling long COVID using Bayesian networks, http://dx.doi.org/10.1101/2024.03.04.24303715
2024
Pérez Chacón G; Estcourt MJ; Totterdell J; Marsh JA; Perrett KP; Campbell DE; Wood N; Gold M; Waddington CS; Sullivan MO; McAlister S; Curtis N; Jones M; McIntyre PB; Holt PG; Richmond PC; Snelling T, 2023, Immunogenicity, reactogenicity, and IgE-mediated immune responses of a mixed whole-cell and acellular pertussis vaccine schedule in Australian infants: a randomised, double-blind, non-inferiority trial, http://dx.doi.org/10.1101/2023.12.20.23300336
2023
Awards
- Chancellor’s Commendation, PhD in Public Health (passed with no corrections, June 2023).
- Inaugural recipient - Stan & Jean Perron Post-PhD Career Launching Award (2022).
- Hugo Lumbreras Award - Top of the class, Diploma in Tropical Medicine and Hygiene, Cayetano Heredia University (Lima, Peru) & University of Alabama (Birmingham), 2016.
Grants
- Can one vaccine help another? Enhancing responses to the 13-valent pneumococcal conjugate vaccine in Western Australian infants (CIB). WA Child Research Fund (WACRF, 2022).
- Pertussis immunisation and atopic outcomes (CIA). Wesfarmers Centre of Vaccines and Infectious Diseases Seed Funding Grant (2018).
- Forrest Research Foundation Supplementary Scholarship (2018).
- Australian Department of Education and Training – Endeavour PhD Scholarship (2018).
- Wesfarmers Centre of Vaccines and Infectious Diseases Top-Up Scholarship (2018).