Before the intervention, infants under two months had a higher risk of getting pertussis in comparison with infants two to six months old (HR 1.15, CI 95% 1.11-1.19). After the intervention, age under two months is a protective factor compared with two to six months (HR 0.90, CI 95% 0.82-0.98). BAY-61-3606 The pertussis incidence reduced in all…[Read more]