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Herd immunity against severe acute respiratory syndrome coronavirus 2 infection in 10 communities, qatar

Jeremijenko, A.; Chemaitelly, H.; Ayoub, H.H.; Alishaq, M.; Abou-Samra, A.-B.; ... more authors ... less authors ( Centers for Disease Control and Prevention (CDC) , 2021 , Article)

We investigated what proportion of the population acquired severe acute respiratory syndrome coronavirus 2 (SARSCoV- 2) infection and whether the herd immunity threshold has been reached in 10 communities in Qatar. The ...

Population immunity of natural infection, primary-series vaccination, and booster vaccination in Qatar during the COVID-19 pandemic: an observational study

Suelen H., Qassim; Chemaitelly, Hiam; Ayoub, Houssein H.; Coyle, Peter; Tang, Patrick; ... more authors ... less authors ( Elsevier , 2023 , Article)

BackgroundWaning of natural infection protection and vaccine protection highlight the need to evaluate changes in population immunity over time. Population immunity of previous SARS-CoV-2 infection or of COVID-19 vaccination ...

BNT162b2 antigen dose and SARS-CoV-2 omicron infection in adolescents

Chemaitelly, Hiam; Ayoub, Houssein H.; Coyle, Peter; Tang, Patrick; Yassine, Hadi M.; ... more authors ... less authors ( Elsevier , 2023 , Other)

COVID-19 vaccine antigen dose might affect protection against SARS-CoV-2 infection,1, 2 but direct evidence to quantify this effect is absent. We conducted a matched, retrospective, cohort study using a regression ...

Long-term COVID-19 booster effectiveness by infection history and clinical vulnerability and immune imprinting: a retrospective population-based cohort study

Hiam, Chemaitelly; Ayoub, Houssein H; Tang, Patrick; Coyle, Peter; Yassine, Hadi M; ... more authors ... less authors ( Elsevier , 2023 , Article)

BackgroundLong-term effectiveness of COVID-19 mRNA boosters in populations with different previous infection histories and clinical vulnerability profiles is inadequately understood. We aimed to investigate the effectiveness ...

Turning point in COVID-19 severity and fatality during the pandemic: a national cohort study in Qatar

Chemaitelly, Hiam; Ayoub, Houssein H; Faust, Jeremy Samuel; Coyle, Peter; Tang, Patrick; ... more authors ... less authors ( BMJ Publishing Group , 2023 , Article)

Objective To assess the evolution of COVID-19 severity and fatality in a unique setting that consistently applied, throughout the pandemic, rigorous and standardised criteria for defining severe COVID-19 outcomes. Methods ...

Association of Serum Vitamin D level and COVID-19 infection: A Case-control Study

AlYafei, Najat Abdrabbo; Jaleel, Bushra Naaz Fathima; Abdel-Salam, Abdel-Salam G.; Al-Saadi, Hamda Ali; Al Abdulla, Samya Ahmad ( HBKU Press , 2022 , Article)

Background: Vitamin D is considered a potent modulator of the immune system, albeit its role in COVID-19 infection is a matter of debate. The present study aimed to estimate the association between serum vitamin D levels ...

Effectiveness of two and three doses of COVID-19 mRNA vaccines against infection, symptoms, and severity in the pre-omicron era: A time-dependent gradient

Layan, Sukik; Chemaitelly, Hiam; Ayoub, Houssein H.; Coyle, Peter; Tang, Patrick; ... more authors ... less authors ( Elsevier , 2024 , Article)

BackgroundVaccines were developed and deployed to combat severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. This study aimed to characterize patterns in the protection provided by the BNT162b2 and ...

Estimating protection afforded by prior infection in preventing reinfection: Applying the test-negative study design.

Ayoub, Houssein H; Tomy, Milan; Chemaitelly, Hiam; Altarawneh, Heba N; Coyle, Peter; ... more authors ... less authors ( Oxford University Press , 2023 , Article)

The COVID-19 pandemic has highlighted the need to use infection testing databases to rapidly estimate effectiveness of prior infection in preventing reinfection ($P{E}_S$) by novel SARS-CoV-2 variants. Mathematical modeling ...

BNT162b2 Versus mRNA-1273 Vaccines: Comparative Analysis of Long-Term Protection Against SARS-CoV-2 Infection and Severe COVID-19 in Qatar

Chemaitelly, Hiam; Ayoub, Houssein H; Coyle, Peter; Tang, Patrick; Hasan, Mohammad R; ... more authors ... less authors ( Wiley , 2024 , Article)

Background: This study provides a head-to-head comparison of the protection provided by the BNT162b2 and mRNA-1273 vaccines against SARS-CoV-2 infection and against severe COVID-19, covering primary series and third ...

A fractional-order model for the novel coronavirus (COVID-19) outbreak

Rajagopal, Karthikeyan; Hasanzadeh, Navid; Parastesh, Fatemeh; Hamarash, Ibrahim Ismael; Jafari, Sajad; ... more authors ... less authors ( Springer , 2020 , Article)

The outbreak of the novel coronavirus (COVID-19), which was firstly reported in China, has affected many countries worldwide. To understand and predict the transmission dynamics of this disease, mathematical models can be ...