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Adjuvanted Influenza Vaccine and Influenza Outbreaks in US Nursing Homes: Results From a Pragmatic Cluster-Randomized Clinical Trial.
- Source :
- Clinical Infectious Diseases; Dec2021, Vol. 73 Issue 11, pe4229-e4236, 8p
- Publication Year :
- 2021
-
Abstract
- Background Influenza outbreaks in nursing homes pose a threat to frail residents and occur even in vaccinated populations. We conducted a pragmatic cluster-randomized trial comparing adjuvanted trivalent influenza vaccine (aTIV) versus trivalent influenza vaccine (TIV). We report an exploratory analysis to compare the effect of aTIV versus TIV on facility-reported influenza outbreaks. Methods We evaluated the impact of the intent-to-treat vaccine assignment on outbreaks reported from November 2016 to March 2017. We collected data according to standard CDC definitions for both suspected outbreaks and those with a laboratory-confirmed case and adjusted for facility-level vaccination rates and resident characteristics in nursing homes. Results Of 823 randomized nursing homes, 777 (aTIV, n = 387; TIV, n = 390) reported information on influenza outbreaks. Treatment groups had similar characteristics at baseline except for race/ethnicity: homes assigned to TIV had a higher percentage of African-American residents (18.0% vs 13.7%). There were 133 versus 162 facility-reported suspected influenza outbreaks in aTIV versus TIV facilities, respectively; of these, 115 versus 140 were laboratory confirmed. The aTIV group experienced a 17% reduction in suspected (rate ratio,.83; 95% confidence interval,.65–1.05) and laboratory-confirmed (.83;.63–1.06) influenza outbreaks. Covariate adjustment increased the estimated reduction for suspected outbreaks to 21% (.79;.61–.99) and 22% for laboratory-confirmed outbreaks (.78;.60–1.02). Conclusions In an exploratory analysis of a cluster-randomized trial we observed 17–21% fewer outbreaks with aTIV than TIV. Clinical Trials Registration. (NCT02882100). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10584838
- Volume :
- 73
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Clinical Infectious Diseases
- Publication Type :
- Academic Journal
- Accession number :
- 154040156
- Full Text :
- https://doi.org/10.1093/cid/ciaa1916