Our study found reinfections were rare before omicron's emergence but became widespread during the omicron era, including among individuals previously infected with omicron, perhaps suggesting accelerated viral evolution. Link: medrxiv.org/content/10.110… #COVID19 #omicron #immunity

A tragic day for science in the Arab World Mohammed Yahia passing… We lost the best Arab science journalist who devoted a life to bring science to the masses… Who fought for the right to truth… Thank you for a mission in a life cut short... You will be remembered my dear friend…

Aljazeera story on the loss of this science hero in the Arab World: aljazeera.net/science/2023/8…

Our recent commentary published in Lancet HIV that addressed the recent closure of the UNAIDS regional office for the Middle East and North Africa. Link: thelancet.com/journals/lanhi… #HIV #UNAIDS #MENA

Our critique of the analysis conducted by Monge and colleagues regarding the effect of immune imprinting has been published at BMJ. Link: bmj.com/content/381/bm… #COVID19 #omicron #immuneimprinting

Honored by the invitation to present our research on HIV in MENA at UCHID in Cairo. It was a great opportunity to connect with colleagues leading the fight on infectious diseases both in our region and internationally. #HIV #infectiousdiseases #MiddleEast #Egypt

Our study in Science Advances showing epidemiological evidence for immune imprinting related to vaccination and protection against reinfection. Link: science.org/doi/10.1126/sc… #COVID19 #omicron #immuneimprinting

Our recent study, published in Influenza and Other Respiratory Viruses, investigated the contribution of various determinants to incidence of SARS-CoV-2 infection and severity among older adults. Link: onlinelibrary.wiley.com/doi/full/10.11… Laith J. Abu-Raddad #COVID19 #Omicron #SARSCoV2 #Qatar

Our study, published in Frontiers in Public Health, found substantial HCV infection burden among laboratory attendees in Jordan. Link: frontiersin.org/articles/10.33… #HCV #Hepatitis #Jordan

Our analysis of conflict mortality in Gaza provides evidence that civilians are an object of war and constitute the primary focus of the conflict. Link: osf.io/preprints/soca… #Palestine #Gaza #Israel #GazaIsraelConflict

Join the #HSTalkSeries with Dr. Hiam Chemaitelly who will provide an overview of our understanding of SARS-CoV-2 immunity based on a series of epidemiologic studies conducted in Qatar over the last three years. aub.edu.lb/fhs/Events/Pag… #FHS #AUB

Our study showed that natural infection protection against reinfection with JN.1 is strong only among those infected within the last 6 months, but this protection wanes rapidly and is entirely lost one year after the previous infection. Link: medrxiv.org/content/10.110… #COVID19 #JN1

Our study, published in Scientific Reports, investigated the prevalence of current hepatitis B virus infection and lifetime hepatitis C virus infection among Qatar's migrant craft and manual workers. Link: nature.com/articles/s4159… #Hepatitis #HBV #HCV #Infection #Workers

Our study, published in BMC Global and Public Health, presents a comprehensive analysis of the epidemiology of Neisseria gonorrhoeae in the Middle East and North Africa region. Link: link.springer.com/article/10.118… BMC Global and Public Health #Gonorrhea #MENA #prevalence

Lhamdulillah, proud to have earned another degree, an MSc in Health Economics, Policy, and Management from the London School of Economics, graduating with Distinction. I am deeply grateful for this incredible journey and look forward to building on this foundation.

On the big shift of #SARSCoV2 when Omicron came along, with a profound drop in protection from prior Covid or vaccination--> reinfections nature.com/articles/s4158… nature Hiam Chemaitelly Roberto Bertollini 🇪🇺🇺🇦 Laith J. Abu-Raddad

Our latest study published in Nature examined the evolution of the SARS-CoV-2 virus, from high transmissibility during the early COVID-19 pandemic to increased immune evasion during the Omicron era. Laith J. Abu-Raddad nature.com/articles/s4158… #SARSCoV2 #immunity #COVID

Our study, published in Communications Medicine, examined immune imprinting effects—specifically, how different histories of SARS-CoV-2 infection, with or without vaccination, influence protection against omicron reinfection. link: nature.com/articles/s4385… Communications Medicine #SARSCoV2

Our study, published in eLife, investigated the healthy vaccinee effect in vaccine effectiveness studies—specifically, the imbalance in underlying health status between vaccinated and unvaccinated individuals. Link: elifesciences.org/articles/103690 eLife - the journal #COVID19 #Vaccines #Qatar

Our study in BMC Infectious Diseases evaluated ChAdOx1 nCoV-19 real-world effectiveness against beta and delta variants, covering infection, symptomatic disease, and severe COVID-19. Link: bmcinfectdis.biomedcentral.com/articles/10.11… #COVID19 #VaccineEffectiveness #SARSCoV2 #ChAdOx1 #COVID19