• All-cause and COVID-19 mortality in Qatar during the COVID-19 pandemic 

      Alnuaimi, Asma A.; Chemaitelly, Hiam; Semaan, Sandy; Almukdad, Sawsan; Al-Kanaani, Zaina; ... more authors ( BMJ Publishing Group , 2023 , Article)
      Objective To investigate all-cause mortality, COVID-19 mortality and all-cause non-COVID-19 mortality in Qatar during the COVID-19 pandemic. Methods A national, retrospective cohort analysis and national, matched, retrospective ...
    • Analyzing inherent biases in SARS-CoV-2 PCR and serological epidemiologic metrics 

      Makhoul, Monia; Abou-Hijleh, Farah; Seedat, Shaheen; Mumtaz, Ghina R.; Chemaitelly, Hiam; ... more authors ( springer nature , 2022 , Article)
      Background: Prospective observational data show that infected persons with the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) remain polymerase chain reaction (PCR) positive for a prolonged duration, and that ...
    • 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 ( 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 ...
    • Characterizing epidemiology of prediabetes, diabetes, and hypertension in Qataris: A cross-sectional study 

      Al-Thani, Mohammed H.; Al-Mutawa, Kholood A.; Alyafei, Salah A.; Ijaz, Muhammad A.; Khalifa, Shamseldin A.H.; ... more authors ( Public Library of Science , 2021 , Article)
      Objectives To characterize the epidemiologic profiles of prediabetes mellitus (preDM), diabetes mellitus (DM), and hypertension (HTN) in Qataris using the nationally representative 2012 Qatar STEPwise Survey. Methods A ...
    • Characterizing trends and associations for hepatitis C virus antibody prevalence in the Middle East and North Africa: meta-regression analyses 

      Mahmud, Sarwat; Chemaitelly, Hiam; Alaama, Ahmed S.; Hermez, Joumana G.; Abu-Raddad, Laith J. ( Springer Nature , 2022 , Article)
      This study characterized population-level trends and associations with hepatitis C virus (HCV) antibody (Ab) prevalence in the Middle East and North Africa (MENA). Data source was the standardized and systematically gathered ...
    • Covid-19 Vaccine Protection among Children and Adolescents in Qatar. 

      Chemaitelly, Hiam; AlMukdad, Sawsan; Ayoub, Houssein H; Altarawneh, Heba N; Coyle, Peter; ... more authors ( Massachusetts Medical Society , 2022 , Article)
      The BNT162b2 vaccine against coronavirus disease 2019 (Covid-19) has been authorized for use in children 5 to 11 years of age and adolescents 12 to 17 years of age but in different antigen doses. We assessed the real-world ...
    • Duration of immune protection of SARS-CoV-2 natural infection against reinfection. 

      Chemaitelly, Hiam; Nagelkerke, Nico; Ayoub, Houssein H; Coyle, Peter; Tang, Patrick; ... more authors ( Oxford University Press , 2022 , Article)
      The future of the SARS-CoV-2 pandemic hinges on virus evolution and duration of immune protection of natural infection against reinfection. We investigated duration of protection afforded by natural infection, the effect ...
    • Duration of mRNA vaccine protection against SARS-CoV-2 Omicron BA.1 and BA.2 subvariants in Qatar. 

      Chemaitelly, Hiam; Ayoub, Houssein H; AlMukdad, Sawsan; Coyle, Peter; Tang, Patrick; ... more authors ( Nature Research , 2022 , Article)
      SARS-CoV-2 Omicron BA.1 and BA.2 subvariants are genetically divergent. We conducted a matched, test-negative, case-control study to estimate duration of protection of the second and third/booster doses of mRNA COVID-19 ...
    • Effect of mRNA Vaccine Boosters against SARS-CoV-2 Omicron Infection in Qatar. 

      Abu-Raddad, Laith J; Chemaitelly, Hiam; Ayoub, Houssein H; AlMukdad, Sawsan; Yassine, Hadi M; ... more authors ( Massachusetts Medical Society , 2022 , Article)
      Waning of vaccine protection against coronavirus disease 2019 (Covid-19) and the emergence of the omicron (or B.1.1.529) variant of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have led to expedited ...
    • Effect of subsidies on healthful consumption: a protocol for a systematic review update 

      Pearson, Fiona; Huangfu, Peijue; Abu-Hijleh, Farah M.; Awad, Susanne F.; Abu-Raddad, Laith J.; ... more authors ( BMJ Publishing Group , 2020 , Article)
      INTRODUCTION: The prevalence of diet-related non-communicable diseases (NCDs) are rapidly increasing in most parts of the world. In order to ameliorate the related public health burden, evidence-informed policies to improve ...
    • Effectiveness of influenza vaccination against SARS-CoV-2 infection among healthcare workers in Qatar 

      Elias, Tayar; Abdeen, Sami; Abed Alah, Muna; Chemaitelly, Hiam; Bougmiza, Iheb; ... more authors ( Elsevier , 2023 , Article)
      BackgroundSome studies have reported that influenza vaccination is associated with lower risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and/or coronavirus disease 2019 (COVID-19) morbidity ...
    • Effectiveness of the neutralizing antibody sotrovimab among high-risk patients with mild-to-moderate SARS-CoV-2 in Qatar 

      Ahmed, Zaqout; Almaslamani, Muna A.; Chemaitelly, Hiam; Hashim, Samar A.; Ittaman, Ajithkumar; ... more authors ( Elsevier , 2022 , Article)
      ObjectivesTo estimate the real-world effectiveness of sotrovimab against severe, critical, or fatal COVID-19 in Qatar at a time in which most SARS-CoV-2 incidences occurred due to the BA.2 Omicron subvariant. MethodsWe ...
    • Effects of previous infection, vaccination, and hybrid immunity against symptomatic Alpha, Beta, and Delta SARS-CoV-2 infections: an observational study 

      Heba N., Altarawneh; Chemaitelly, Hiam; Ayoub, Houssein H.; Tang, Patrick; Hasan, Mohammad R.; ... more authors ( Elsevier , 2023 , Article)
      BackgroundProtection against SARS-CoV-2 symptomatic infection and severe COVID-19 of previous infection, mRNA two-dose vaccination, mRNA three-dose vaccination, and hybrid immunity of previous infection and vaccination ...
    • Effects of SARS-CoV-2 Alpha, Beta, and Delta variants, age, vaccination, and prior infection on infectiousness of SARS-CoV-2 infections 

      Qassim, Suelen H.; Hasan, Mohammad R.; Tang, Patrick; Chemaitelly, Hiam; Ayoub, Houssein H.; ... more authors ( Frontiers Media , 2022 , Article)
      In 2021, Qatar experienced considerable incidence of SARS-CoV-2 infection that was dominated sequentially by the Alpha, Beta, and Delta variants. Using the cycle threshold (Ct) value of an RT-qPCR-positive test to proxy ...
    • Epidemiology of herpes simplex virus type 1 and genital herpes in Australia and New Zealand: Systematic review, meta-analyses and meta-regressions 

      Almukdad, Sawsan; Harfouche, Manale; Farooqui, Uzma S.; Aldos, Lana; Abu-Raddad, Laith J. ( Cambridge University Press , 2023 , Article)
      Herpes simplex virus type 1 (HSV-1) infection is a lifelong infection that is acquired primarily orally and during childhood. We aimed to characterise HSV-1 epidemiology in Australia and New Zealand. HSV-1-related data as ...
    • Epidemiology of herpes simplex virus type 1 in the United States: Systematic review, meta-analyses, and meta-regressions 

      Rwedah A., Ageeb; Harfouche, Manale; Chemaitelly, Hiam; Abu-Raddad, Laith J. ( Elsevier , 2024 , Article)
      This study aimed to analytically describe the epidemiology of herpes simplex virus type 1 (HSV-1) infection in the United States through a systematic review and meta-analytics. We reviewed 159 publications, identifying 190 ...
    • Epidemiology of herpes simplex virus type 2 in Europe: systematic review, meta-analyses, and meta-regressions 

      Alareeki, Asalah; Osman, Aisha M.M.; Khandakji, Mohannad N.; Looker, Katharine J.; Harfouche, Manale; ... more authors ( Elsevier , 2023 , Article)
      Background: Herpes simplex virus type 2 (HSV-2) infection is a globally prevalent, life-long, sexually transmitted infection. This study characterized HSV-2 seroprevalence in Europe for various at-risk populations and ...
    • Epidemiology of herpes simplex virus type 2 in sub-Saharan Africa: Systematic review, meta-analyses, and meta-regressions 

      Harfouche, Manale; Abu-Hijleh, Farah M.; James, Charlotte; Looker, Katharine J.; Abu-Raddad, Laith J. ( EClinicalMedicine , 2021 , Article)
      Background: Herpes simplex virus type 2 (HSV-2) infection is a prevalent, sexually transmitted infection with a sizable disease burden that is highest in sub-Saharan Africa. This study aimed to characterize HSV-2 epidemiology ...
    • Evaluating Hospital Admission Data as Indicators of COVID-19 Severity: A National Assessment in Qatar. 

      Sukik, Layan; Chemaitelly, Hiam; Ayoub, Houssein H; Coyle, Peter; Tang, Patrick; ... more authors ( Oxford University Press , 2025 , Article)
      Accurately assessing SARS-CoV-2 infection severity is essential for understanding the health impact of the infection and evaluating the effectiveness of interventions. This study investigated whether SARS-CoV-2-associated ...
    • Global epidemiology of Neisseria gonorrhoeae in infertile populations: Systematic review, meta-analysis and metaregression 

      Chemaitelly, Hiam; Majed, Alzahraa; Abu-Hijleh, Farah; Blondeel, Karel; Matsaseng, Thabo Christopher; ... more authors ( BMJ Journals , 2021 , Article)
      Objective To provide an in-depth systematic assessment of the global epidemiology of gonorrhoea infection in infertile populations. Methods A systematic literature review was conducted up to 29 April 2019 on international ...