Apnea and its possible relationship to immunization in ex-premature infants.

Abstract This study compared the characteristics of infants hospitalized with apnea that participated in a vaccine trial compared with two control groups which consisted of 100 infants randomly selected from the same vaccine trial and 52 consecutively born very low birth weight (VLBW) infants. A total of 23 infants were admitted with apnea of whom 19 weighed p  = 0.005). Ten of 11 children with apnea within 72 h of immunization were possibly related to vaccination.