Louisiana officials waited 2 months after the state's first pertussis (whooping cough)-related deaths in years—which occurred ...
According to the authors, vaccine effectiveness against infection reached 44.7% (95% confidence interval [CI], 37.7% to 50.9%) 4 weeks postvaccination, declined to 35.5% (95% CI, 30.2% to 40.5%) at 10 ...
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