“…In the above-described study, the highest rate of infection was observed among those was reported in a study among young children. 19 However, considering that information regarding the time of vaccination was not available, these patients could have been recently vaccinated and, therefore, did not reached the adequate protective antibody titers, which are acquired at least 2 weeks postvaccination. Nonetheless, all vaccinated patients were not later hospitalized, which could point to some immunization protection.…”