Effect of bathing on skin flora of preterm newborns

Abstract

Objective: To assess the effect of bathing with water only or with mild pH neutral soap and water on skin flora of preterm newborns.

Method: Randomized blinded clinical trial that enrolled 73 preterm newborns whose gestational age was between 28 and 35 weeks and birth weight between 800 and 1800 g. At the age of 3 days the infants were randomly assigned to a group that was given daily baths either with water only, or with soap and water for 7 or more days. Antibiotic treatment delayed onset of the trial in some preterm infants. On the final day of bathing axillary bacterial cultures were obtained before and 30 minutes after bathing.

Results: At the time of axillary culturing, the mean age of the newborns was 19 days. Coagulase-negative Staphylococcus was the most prevalent microorganism in both groups. No significant difference was found in the count of microorganism colonies between both groups. The comparison of the number of bacterial colonies between the time before and after bath, carried out by repeated-measures ANOVA showed a significant difference over time in the two groups, without a significant difference between the two groups.

Conclusions: Bathing preterm newborns with water only or with soap and water produces similar effects on skin colonization of a preterm neonate. Both are effective to decrease the number of colonies of Gram-positive and Gram-negative bacteria.