Abstract
This pilot study was undertaken to examine whether killed influenza vaccine causes exacerbations in asthmatic adults. Thirty-three stable asthmatics recorded peak expiratory flow (PEF), asthma symptoms, and use of asthma medication for 2 weeks, and then received killed influenza vaccine. Thereafter they recorded PEF, asthma symptoms and use of medication for a further 2 weeks. Comparison of recordings during the 2 weeks before and after vaccination revealed that influenza vaccine was not associated with reduction in PEF ( P=0.76), increase in asthma symptoms ( P=0.17) or use of asthma medication ( P=0.58). Similar results for PEF ( P=0.49), asthma symptoms ( P=0.17), and asthma medication ( P=0.16) were obtained when the analysis was restricted to the 2 days before and after vaccination.
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