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Frontiers in Medicine|March 26, 2024
Addressing bias in the definition of SARS-CoV-2 reinfection: implications for underestimationHiam Chemaitelly, Houssein H Ayoub, Patrick Tang, et al.
Plos One|September 26, 2025
Evaluating the cost-effectiveness of COVID-19 mRNA primary-series vaccination in Qatar: An integrated epidemiological and economic analysisHiam Chemaitelly, Houssein H Ayoub, Peter Coyle, et al.
Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America|December 14, 2020
Assessment of the Risk of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Reinfection in an Intense Reexposure SettingLaith J Abu-Raddad, Hiam Chemaitelly, Joel A Malek, et al.
Nature|February 5, 2025
Differential protection against SARS-CoV-2 reinfection pre- and post-OmicronHiam Chemaitelly, Houssein H Ayoub, Peter Coyle, et al.
Vaccine|July 30, 2025
Comparative effectiveness of one versus two doses of COVID-19 vaccines in Qatar: Evidence of converging protection over timeHiam Chemaitelly, Houssein H Ayoub, Peter Coyle, et al.
Elife|June 9, 2025
Assessing healthy vaccinee effect in COVID-19 vaccine effectiveness studies: a national cohort study in QatarHiam Chemaitelly, Houssein H Ayoub, Peter Coyle, et al.
Scientific Reports|October 8, 2025
Effectiveness and durability of a fourth dose of ancestral-strain mRNA vaccines against SARS-CoV-2 infection: a nationwide matched cohort study in QatarLayan Sukik, Hiam Chemaitelly, Houssein H Ayoub, et al.
BMC Infectious Diseases|August 17, 2025
Effectiveness of ChAdOx1 nCoV-19 (Vaxzevria) primary series vaccine against SARS-CoV-2 beta and delta variants: a nationwide studyHiam Chemaitelly, Houssein H Ayoub, Peter Coyle, et al.
Journal of Global Health|February 9, 2022
Characterizing the effective reproduction number during the COVID-19 pandemic: Insights from Qatar's experienceRaghid Bsat, Hiam Chemaitelly, Peter Coyle, et al.
Plos Medicine|December 16, 2021
Introduction and expansion of the SARS-CoV-2 B.1.1.7 variant and reinfections in Qatar: A nationally representative cohort studyLaith J Abu-Raddad, Hiam Chemaitelly, Houssein H Ayoub, et al.
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