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First ten reactions reported in order of frequency after administration of hexavalent vaccine in 2016 in Italy.
| Type of reaction | Frequency (No.) |
|---|---|
| Fever | 618 |
| Hyperpyrexia | 146 |
| Cry | 124 |
| Irritability | 100 |
| Drowsiness | 91 |
| Swallow at the time of vaccination | 55 |
| Erythema at the time of vaccination | 51 |
| Pain at the time of vaccination | 49 |
| Agitation | 41 |
| Diarrhea | 40 |
