Browsing by Author "Chemaitelly, Hiam"
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Addressing bias in the definition of SARS-CoV-2 reinfection: implications for underestimation
Chemaitelly, Hiam; Ayoub, Houssein H.; Tang, Patrick; Yassine, Hadi M.; Al Thani, Asmaa A.; Hasan, Mohammad R.; Coyle, Peter; Al-Kanaani, Zaina; Al-Kuwari, Einas; Jeremijenko, Andrew; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Shaik, Riyazuddin Mohammad; Abdul-Rahim, Hanan F.; Nasrallah, Gheyath K.; Al-Kuwari, Mohamed Ghaith; Butt, Adeel A.; Al-Romaihi, Hamad Eid; Al-Thani, Mohamed H.; Al-Khal, Abdullatif; Bertollini, Roberto; Abu-Raddad, Laith J.... more authors ... less authors ( Frontiers Media , 2024 , Article)Introduction: Reinfections are increasingly becoming a feature in the epidemiology of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. However, accurately defining reinfection poses methodological ... -
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; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Al-Romaihi, Hamad Eid; Butt, Adeel A.; Al-Thani, Mohamed H.; Bertollini, Roberto; Abdulmalik, Mariam; Al-Khal, Abdullatif; Abu-Raddad, Laith J.... more authors ... less 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; Ayoub, Houssein; Abu-Raddad, Laith J.... more authors ... less 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 ... -
Assessment of the Risk of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Reinfection in an Intense Reexposure Setting
Abu-Raddad, Laith J.; Chemaitelly, Hiam; Malek, Joel A.; Ahmed, Ayeda A.; Mohamoud, Yasmin A.; Younuskunju, Shameem; Ayoub, Houssein H.; Al Kanaani, Zaina; Al Khal, Abdullatif; Al Kuwari, Einas; Butt, Adeel A.; Coyle, Peter; Jeremijenko, Andrew; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Shaik, Riyazuddin Mohammad; Abdul Rahim, Hanan F.; Yassine, Hadi M.; Al Kuwari, Mohamed G.; Al Romaihi, Hamad Eid; Al-Thani, Mohamed H.; Bertollini, Roberto... more authors ... less authors ( NLM (Medline) , 2021 , Article)BACKGROUND: Risk of reinfection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is unknown. We assessed the risk and incidence rate of documented SARS-CoV-2 reinfection in a cohort of laboratory-confirmed ... -
Associations of Vaccination and of Prior Infection with Positive PCR Test Results for SARS-CoV-2 in Airline Passengers Arriving in Qatar
Bertollini, Roberto; Chemaitelly, Hiam; Yassine, Hadi M.; Al-Thani, Mohamed H.; Al-Khal, Abdullatif; Abu-Raddad, Laith J.... more authors ... less authors ( American Medical Association , 2021 , Article)The SARS-CoV-2 pandemic has severely affected international travel. With efficacious COVID-19 vaccines available, Qatar implemented a pilot program between February 18 and April 26, 2021, to ease travel restrictions by ... -
Bivalent mRNA-1273.214 vaccine effectiveness against SARS-CoV-2 omicron XBB* infections
Chemaitelly, Hiam; Ayoub, Houssein H.; AlMukdad, Sawsan; Faust, Jeremy S.; Tang, Patrick; Coyle, Peter; Yassine, Hadi M.; Al Thani, Asmaa A.; Al-Khatib, Hebah A.; Hasan, Mohammad R.; Al-Kanaani, Zaina; Al-Kuwari, Einas; Jeremijenko, Andrew; Kaleeckal, Anvar H.; Latif, Ali N.; Shaik, Riyazuddin M.; Abdul-Rahim, Hanan F.; Nasrallah, Gheyath K.; Al-Kuwari, Mohamed G.; Butt, Adeel A.; Al-Romaihi, Hamad E.; Al-Thani, Mohamed H.; Al-Khal, Abdullatif; Bertollini, Roberto; Abu-Raddad, Laith J.... more authors ... less authors (2023 , Article)In October of 2022, Qatar introduced COVID-19 bivalent vaccination for persons ≥ 12 years using the 50-μg mRNA-1273.214 vaccine combining SARS-CoV-2 ancestral and omicron BA.1 strains.1 We estimated this vaccine’s effectiveness ... -
BNT162b2 antigen dose and SARS-CoV-2 omicron infection in adolescents
Chemaitelly, Hiam; Ayoub, Houssein H.; Coyle, Peter; Tang, Patrick; Yassine, Hadi M.; Al Thani, Asmaa A.; Al-Khatib, Hebah A.; Hasan, Mohammad R.; Al-Kanaani, Zaina; Al-Kuwari, Einas; Jeremijenko, Andrew; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Shaik, Riyazuddin Mohammad; Abdul-Rahim, Hanan F.; Nasrallah, Gheyath K.; Al-Kuwari, Mohamed Ghaith; Al-Romaihi, Hamad Eid; Butt, Adeel A.; Al-Thani, Mohamed H.; Al-Khal, Abdullatif; Bertollini, Roberto; Abu-Raddad, Laith J.... 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 ... -
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; Yassine, Hadi M; Al Thani, Asmaa A; Al-Kanaani, Zaina; Al-Kuwari, Einas; Jeremijenko, Andrew; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Shaik, Riyazuddin Mohammad; Abdul-Rahim, Hanan F; Nasrallah, Gheyath K; Al-Kuwari, Mohamed Ghaith; Butt, Adeel A; Al-Romaihi, Hamad Eid; Al-Thani, Mohamed H; Al-Khal, Abdullatif; Bertollini, Roberto; Abu-Raddad, Laith J... 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 ... -
Characterizing the effective reproduction number during the COVID-19 pandemic: Insights from Qatar's experience
Bsat, Raghid; Chemaitelly, Hiam; Coyle, Peter; Tang, Patrick; Hasan, Mohammad R.; Kanaani, Zaina Al; Kuwari, Einas Al; Butt, Adeel A.; Jeremijenko, Andrew; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Shaik, Riyazuddin Mohammad; Nasrallah, Gheyath K.; Benslimane, Fatiha M.; Khatib, Hebah A.Al; Yassine, Hadi M.; Kuwari, Mohamed G.Al; Romaihi, Hamad Eid Al; Al-Thani, Mohamed H.; Khal, Abdullatif Al; Bertollini, Roberto; Abu-Raddad, Laith J.; Ayoub, Houssein H.... more authors ... less authors ( Edinburgh University Global Health Society , 2022 , Article)Background The effective reproduction number, Rt, is a tool to track and understand pandemic dynamics. This investigation of Rt estimations was conducted to guide the national COVID-19 response in Qatar, from the onset of ... -
Characterizing the Qatar advanced-phase SARS-CoV-2 epidemic
Abu-Raddad, Laith J.; Chemaitelly, Hiam; Ayoub, Houssein H.; Al Kanaani, Zaina; Al Khal, Abdullatif; Al Kuwari, Einas; Butt, Adeel A.; Coyle, Peter; Jeremijenko, Andrew; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Owen, Robert C.; Rahim, Hanan F.Abdul; Al Abdulla, Samya A.; Al Kuwari, Mohamed G.; Kandy, Mujeeb C.; Saeb, Hatoun; Ahmed, Shazia Nadeem N.; Al Romaihi, Hamad Eid; Bansal, Devendra; Dalton, Louise; Al-Thani, Mohamed H.; Bertollini, Roberto... more authors ... less authors ( springer nature , 2021 , Article)The overarching objective of this study was to provide the descriptive epidemiology of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) epidemic in Qatar by addressing specific research questions through 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 ... -
Comparative analysis and evolution of civilian versus combatant mortality ratios in Israel-Gaza conflicts, 2008–2023
Ayoub, Houssein H.; Chemaitelly, Hiam; Abu-Raddad, Laith J. ( Frontiers Media SA , 2024 , Article)Background: There is a need for statistical methodologies that scrutinize civilian casualties in conflicts, evaluating the degree to which the conduct of war affects civilians and breaches the laws of war. Employing an ... -
Coronavirus Disease 2019 Disease Severity in Children Infected With the Omicron Variant
Butt, A.A.; Butt, Adeel A.; Dargham, Soha R.; Loka, Srusvin; Shaik, Riyazuddin M.; Chemaitelly, Hiam; Tang, Patrick; Hasan, Mohammad R.; Coyle, Peter V.; Yassine, Hadi M.; Al-Khatib, Hebah A.; Smatti, Maria K.; Kaleeckal, Anvar H.; Latif, Ali Nizar; Zaqout, Ahmed; Almaslamani, Muna A.; Al Khal, Abdullatif; Bertollini, Roberto; Abou-Samra, Abdul Badi; Abu-Raddad, Laith J.... more authors ... less authors ( NLM (Medline) , 2022 , Article)SHORT SUMMARY: Severe acute respiratory syndrome coronavirus 2 infection from the Omicron variant in children/adolescents is less severe than infection from the Delta variant. Those 6 to <18 years also have less severe ... -
Covid-19 Vaccine Protection among Children and Adolescents in Qatar.
Chemaitelly, Hiam; AlMukdad, Sawsan; Ayoub, Houssein H; Altarawneh, Heba N; Coyle, Peter; Tang, Patrick; Yassine, Hadi M; Al-Khatib, Hebah A; Smatti, Maria K; Hasan, Mohammad R; Al-Kanaani, Zaina; Al-Kuwari, Einas; Jeremijenko, Andrew; Kaleeckal, Anvar H; Latif, Ali N; Shaik, Riyazuddin M; Abdul-Rahim, Hanan F; Nasrallah, Gheyath K; Al-Kuwari, Mohamed G; Al-Romaihi, Hamad E; Butt, Adeel A; Al-Thani, Mohamed H; Al-Khal, Abdullatif; Bertollini, Roberto; Abu-Raddad, Laith J... more authors ... less 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 ... -
Differential protection against SARS-CoV-2 reinfection pre- and post-Omicron
Chemaitelly, Hiam; Ayoub, Houssein H.; Coyle, Peter; Tang, Patrick; Hasan, Mohammad R.; Yassine, Hadi M.; Al Thani, Asmaa A.; Al-Kanaani, Zaina; Al-Kuwari, Einas; Jeremijenko, Andrew; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Shaik, Riyazuddin Mohammad; Abdul-Rahim, Hanan F.; Nasrallah, Gheyath K.; Al-Kuwari, Mohamed Ghaith; Butt, Adeel A.; Al-Romaihi, Hamad Eid; Al-Thani, Mohamed H.; Al-Khal, Abdullatif; Bertollini, Roberto; Abu-Raddad, Laith J.... more authors ... less authors ( Springer Nature , 2025 , Article)The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has rapidly evolved over short timescales, leading to the emergence of more transmissible variants such as Alpha and Delta1, 2–3. The arrival of the Omicron ... -
Duration of immune protection of SARS-CoV-2 natural infection against reinfection.
Chemaitelly, Hiam; Nagelkerke, Nico; Ayoub, Houssein H; Coyle, Peter; Tang, Patrick; Yassine, Hadi M; Al-Khatib, Hebah A; Smatti, Maria K; Hasan, Mohammad R; Al-Kanaani, Zaina; Al-Kuwari, Einas; Jeremijenko, Andrew; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Shaik, Riyazuddin Mohammad; Abdul-Rahim, Hanan F; Nasrallah, Gheyath K; Al-Kuwari, Mohamed Ghaith; Butt, Adeel A; Al-Romaihi, Hamad Eid; Al-Thani, Mohamed H; Al-Khal, Abdullatif; Bertollini, Roberto; Abu-Raddad, Laith J... more authors ... less 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; Yassine, Hadi M; Al-Khatib, Hebah A; Smatti, Maria K; Hasan, Mohammad R; Al-Kanaani, Zaina; Al-Kuwari, Einas; Jeremijenko, Andrew; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Shaik, Riyazuddin Mohammad; Abdul-Rahim, Hanan F; Nasrallah, Gheyath K; Al-Kuwari, Mohamed Ghaith; Butt, Adeel A; Al-Romaihi, Hamad Eid; Al-Thani, Mohamed H; Al-Khal, Abdullatif; Bertollini, Roberto; Abu-Raddad, Laith J... more authors ... less 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 ... -
Dynamics of Neisseria gonorrhoeae transmission among female sex workers and clients: A mathematical modeling study
Houssein H., Ayoub; Tomy, Milan; Chemaitelly, Hiam; Omori, Ryosuke; Buse, Kent; Low, Nicola; Hawkes, Sarah; Abu-Raddad, Laith J.... more authors ... less authors ( Elsevier , 2024 , Article)BackgroundThis study aimed to examine the transmission dynamics of Neisseria gonorrhoeae (NG) in heterosexual sex work networks (HSWNs) and the impact of variation in sexual behavior and interventions on NG epidemiology. ... -
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; Al-Khatib, Hebah A; Smatti, Maria K; Tang, Patrick; Hasan, Mohammad R; Coyle, Peter; Al-Kanaani, Zaina; Al-Kuwari, Einas; Jeremijenko, Andrew; Kaleeckal, Anvar H; Latif, Ali N; Shaik, Riyazuddin M; Abdul-Rahim, Hanan F; Nasrallah, Gheyath K; Al-Kuwari, Mohamed Ghaith; Butt, Adeel A; Al-Romaihi, Hamad Eid; Al-Thani, Mohamed H; Al-Khal, Abdullatif; Bertollini, Roberto... more authors ... less 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 ... -
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; Ayoub, Houssein H.; Kaleeckal, Anvar Hassan; Latif, Ali Nizar; Shaik, Riyazuddin Mohammad; Al-Romaihi, Hamad Eid; Al-Thani, Mohamed H.; Bertollini, Roberto; Abu-Raddad, Laith J.; Al-Khal, Abdullatif... more authors ... less 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 ...