Amniotic fluid was obtained per vagina from 228 mothers with premature rupture of the membranes and examined bacteriologically. The aim was to assess the importance of amniotic fluid contamination and the risk of foetal infection in the absence of systematic antibiotic therapy in the mothers. The incidence of amniotic fluid contamination was apparently greater in those mothers who had received antibiotics although the proportion of neonates with a true infection (3%) was almost identical. The absence of selection of resistant organisms is indicated by the marked preponderance of streptococci and the scarcity of Gram negative enterobacteriacae. Thus it is reasonable not to give systemic antibiotics but to culture the amniotic fluid. Infection can then be anticipated and in affected neonates the appropriate therapy started immediately.
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