Results
A total of 1130 children agreed to partic- ipate; 93% were 9 years old at the beginning of
the study, and a diary was completed for all of them. For the 3 doses, during the 7 and 28 days after immunization, 24.2% and 47.5% of chil- dren, respectively, suffered at least 1 adverse event. For all doses, when pre- and postvacci- nation periods were considered, the incidence of health problems was higher only during the first week after vaccination (Figure 1). In the first week, 44%, 26%, and 38% of all adverse events were attributable to the first, second, and third dose of the vaccine, respectively (Fig- ure 1). All local reactions were attributable to immunization. During the first week after im- munization, the attributable risks of headaches, gastrointestinal problems, and respiratory tract
Results
A total of 1130 children agreed to partic- ipate; 93% were 9 years old at the beginning of
the study, and a diary was completed for all of them. For the 3 doses, during the 7 and 28 days after immunization, 24.2% and 47.5% of chil- dren, respectively, suffered at least 1 adverse event. For all doses, when pre- and postvacci- nation periods were considered, the incidence of health problems was higher only during the first week after vaccination (Figure 1). In the first week, 44%, 26%, and 38% of all adverse events were attributable to the first, second, and third dose of the vaccine, respectively (Fig- ure 1). All local reactions were attributable to immunization. During the first week after im- munization, the attributable risks of headaches, gastrointestinal problems, and respiratory tract
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