Browsing by Subject "Delta variant"

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    Active viral shedding in a vaccinated hospitalized patient infected with the delta variant (B.1.617.2) of SARS-CoV-2 and challenges of de-isolation
    (Elsevier, 2022) Alshukairi, Abeer N.; Al-Omari, Awad; Al-Tawfiq, Jaffar A.; El-Kafrawy, Sherif A.; El-Daly, Mai M.; Hassan, Ahmed M.; Faizo, Arwa A.; Alandijany, Thamir A.; Dada, Ashraf; Saeedi, Mohammed F.; Alhamlan, Fatma S.; Al Hroub, Mohammad K.; Qushmaq, Ismael; Azhar, Esam I.; Medicine, School of Medicine
    In the era of SARS-CoV-2 variants and COVID-19 vaccination, the duration of infectious viral shedding and isolation in post vaccine breakthrough infections is challenging and depends on disease severity. The current study described a case of SARS-CoV-2 Delta variant pneumonia requiring hospitalization. The patient received two doses of BNT162b2 COVID-19 vaccines, and he had positive SARS-CoV-2 viral cultures 12 days post symptom onset. The time between the second dose of vaccine and the breakthrough infection was 6 months. While immunosuppression is a known risk factor for prolonged infectious viral shedding, age and time between vaccination and breakthrough infection are important risk factors that warrant further studies.
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    Implication of the emergence of the delta (B.1.617.2) variants on vaccine effectiveness
    (Springer, 2022-06) Al‑Tawfiq, Jaffar A.; Koritala, Thoyaja; Alhumaid, Saad; Barry, Mazin; Alshukairi, Abeer N.; Temsah, Mohamad‑Hani; Al Mutair, Abbas; Rabaan, Ali; Tirupathi, Raghavendra; Gautret, Philippe; Medicine, School of Medicine
    Introduction: COVID-19 vaccines have been developed to compact the current SARS-CoV-2 pandemic and have been administered to people all over the world. These vaccines have been quite effective in reducing the possibility of severe illness, hospitalization and death. However, the recent emergence of Variants of Concern specifically the delta variant, B.1.617.2, had resulted in additional waves of the pandemic. Methods: We aim to review the literature to understand the transmission and disease severity, and determine the efficacy of the current COVID-19 vaccines. We searched Pubmed, Scopus, and Embase till August 4th 2021, and used the search terms "delta variant", "vaccinations"," breakthrough infections", and "neutralizing antibody". For the meta-analysis, 21 studies were screened in particular and five articles (148,071 cases) were included in the study, and only four were analyzed in the meta-analysis. Results: In this review, both in vitro and in vivo studies showed significant reductions in neutralization rates against delta variants for vaccinated individuals and convalescent patients with prior history of COVID-19. However, There was a lower incidence of infection with SARS-CoV-2 due to Delta variant was found after the second dose of Pfizer-BioNTech, Oxford-AstraZeneca and Moderna vaccines. Conclusion: In fully vaccinated individuals, symptomatic infection with the delta variant was significantly reduced, and therefore, vaccinations play an important role to assist the fight against delta variant.