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Almadhoon HW, Hamdallah A, Elsayed SM, Hagrass AI, Hasan MT, Fayoud AM, Al-Kafarna M, Elbahnasawy M, Alqatati F, Ragab KM, Zaazouee MS, Hasabo EA. The effect of influenza vaccine in reducing the severity of clinical outcomes in patients with COVID-19: a systematic review and meta-analysis. Sci Rep 2022; 12:14266. [PMID: 35995930 PMCID: PMC9395333 DOI: 10.1038/s41598-022-18618-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 08/16/2022] [Indexed: 11/09/2022] Open
Abstract
Recent evidence suggests that vaccination against influenza may reduce the clinical outcomes of COVID-19. This study looked at the link between influenza vaccination and the severity of COVID-19 infection. We searched five databases until August 2021. We included studies that reported the relationship between influenza vaccination and COVID-19 outcomes. We pooled the data as risk ratio (RR) or mean difference (MD), with 95% confidence intervals (CIs), the data pooled using fixed and random effects models according to the heterogeneity of results. Sixteen observational studies with 191,496 COVID-19 patients were included. In terms of mechanical ventilation, our analysis showed a significant favor for the influenza vaccinated group over the non-vaccinated group (RR = 0.72, 95% CI [0.54, 0.96], P = 0.03). However, the analysis indicated no statistically significant differences between vaccinated and non-vaccinated groups in the term of mortality rate (RR = 1.20, 95% CI [0.71, 2.04], P = 0.50), hospital admissions (RR = 1.04, 95% CI [0.84, 1.29], P = 0.75), intensive care admissions (RR = 0.84, 95% CI [0.44, 1.62], P = 0.60). There were no significant differences between those who had received the influenza vaccine and those who had not in COVID-19 clinical outcomes, except for mechanical ventilation which showed a significantly lower risk in the influenza vaccinated group compared to the non-vaccinated one. However, future research is encouraged as our data have limitations, and the influenza vaccine is regularly updated. Also, this does not exclude the importance of the influenza vaccine during the COVID-19 pandemic.
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Affiliation(s)
- Hossam Waleed Almadhoon
- Faculty of Dentistry, Al-Azhar University - Gaza, Gaza Strip, Palestine.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Aboalmagd Hamdallah
- Faculty of Medicine, Al-Azhar University, Damietta, Egypt.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Sarah Makram Elsayed
- Faculty of Medicine, October 6 University, Giza, Egypt.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Abdulrahman Ibrahim Hagrass
- Faculty of Medicine for Boys, Al-Azhar University, Cairo, Egypt.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Mohammed Tarek Hasan
- Faculty of Medicine for Boys, Al-Azhar University, Cairo, Egypt.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Aya Mamdouh Fayoud
- Faculty of Pharmacy, Kafr El Sheikh University, Kafr El Sheikh, Egypt.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Mohammed Al-Kafarna
- Faculty of Pharmacy, Al-Azhar University - Gaza, Gaza Strip, Palestine.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Mohammad Elbahnasawy
- Faculty of Medicine, Alexandria University, Alexandria, Egypt.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Fadel Alqatati
- Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Khaled Mohamed Ragab
- Faculty of Medicine, Minia University, Minia, Egypt.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Mohamed Sayed Zaazouee
- Faculty of Medicine, Al-Azhar University, Assiut, Egypt.,International Medical Research Association (IMedRA), Cairo, Egypt
| | - Elfatih A Hasabo
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan. .,International Medical Research Association (IMedRA), Cairo, Egypt.
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