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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.
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.
Open Forum Infectious Diseases|March 17, 2025
Evaluating Hospital Admission Data as Indicators of COVID-19 Severity: A National Assessment in QatarLayan Sukik, Hiam Chemaitelly, Houssein H Ayoub, et al.
BMJ Open Respiratory Research|March 26, 2025
Protection conferred by SARS-CoV-2 infection across a spectrum of reinfection symptoms and severitiesLayan Sukik, Hiam Chemaitelly, Houssein H Ayoub, et al.
JAMA|November 1, 2021
Association of Prior SARS-CoV-2 Infection With Risk of Breakthrough Infection Following mRNA Vaccination in QatarLaith J Abu-Raddad, Hiam Chemaitelly, Houssein H Ayoub, et al.
Communications Medicine|July 2, 2025
Immune histories and natural infection protection during the omicron eraHiam Chemaitelly, Houssein H Ayoub, Niklas Bobrovitz, et al.
Nature Communications|January 28, 2022
Relative infectiousness of SARS-CoV-2 vaccine breakthrough infections, reinfections, and primary infectionsLaith J Abu-Raddad, Hiam Chemaitelly, Houssein H Ayoub, et al.
Nature Communications|August 9, 2022
Protection of Omicron sub-lineage infection against reinfection with another Omicron sub-lineageHiam Chemaitelly, Houssein H Ayoub, Peter Coyle, et al.
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