Facial Paralysis Following Infuenza Vaccination: A Disproportionality Analysis Using the Vaccine Adverse Event Reporting System Database

Kamath, Ashwin K Anandaraya and Maity, Nivedita and Nayak, Arjun Srinivas Manel (2020) Facial Paralysis Following Infuenza Vaccination: A Disproportionality Analysis Using the Vaccine Adverse Event Reporting System Database. Clinical Drug Investigation, 40. pp. 883-889. ISSN 11732563

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Background and Objective Several cases of facial paralysis have been reported following infuenza vaccination; however, recent surveillance studies have not shown an increased risk. In this study, we analyzed the vaccine adverse event reporting system (VAERS) data to determine whether the facial paralysis reporting rate is higher in those who received infuenza vaccination compared with those who received other vaccines. Methods We evaluated reports of facial paralysis in people who received infuenza vaccination during January 2015 to October 2019 using Medical Dictionary for Regulatory Activities Preferred Terms. A disproportionality analysis was performed to determine the proportional reporting ratio (PRR), Chi-square statistic, and reporting odds ratio (ROR) with 95% confdence interval (CI). The demographic and clinical characteristics of the cases were also analyzed. Results Two hundred ffty cases of facial paralysis following infuenza vaccination were reported during the study period. The median age of the patients was 45 (interquartile range, 30–57) years; 132 (52.8%) patients were females. The majority of the patients received the injected trivalent or quadrivalent seasonal infuenza vaccine by intramuscular route. The PRR, Chi-square statistic, and ROR (95% CI) was 2.44, 122.32, and 2.44 (2.08–2.88), respectively; on excluding cases involving concomitant paresis/paralysis of limbs or Guillain–Barre syndrome, the disproportionality statistics were 2.30, 89.37, and 2.30 (1.93–2.75), respectively. Conclusions Our study shows increased reporting of facial paralysis following infuenza vaccination as compared with other vaccines. Considering the inherent limitations of the VAERS database analysis, and the fact that disproportionality measures only indicate the presence of a signal, our study fndings need to be explored in well-designed prospective pharmacoepidemiologic studies

Item Type: Article
Uncontrolled Keywords: Influenza, Vaccine, Facial paralysis, Adverse event
Subjects: Medicine > KMC Mangalore > Pharmacology
Medicine > KMC Mangalore > Medicine
Depositing User: KMCMLR User
Date Deposited: 30 Dec 2020 03:56
Last Modified: 30 Dec 2020 03:56
URI: http://eprints.manipal.edu/id/eprint/156129

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