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Background  To investigate bacterial flora and antibiotics susceptibility of  Streptococcus pneumoniae  isolated from the conjunctival sac of heathy children.    Methods  Bacteria were isolated from the secretions of conjunctival sac of healthy children between 2015 and 2018. Antimicrobial susceptibility of isolated  S. pneumoniae  strains were determined using microbroth dilution method.    Results  The sac secretions were collected from a total of 6440 children. 1409 samples presented bacterial growth, accounting for 21.8% of the samples. Among the 22 bacterial species isolated, 528 samples presented Gram-positive  Staphylococcus  spp. growth, accounting for 37.4% of the isolates, followed by  Corynebacterium  spp., counting for 30% of the isolates and  Streptococcus pneumoniae,  counting for 21.4% of the isolates. Antibiotics susceptibility tests showed that the majority of  S. pneumoniae  isolates were sensitive to most antibiotics tested. However, 72.8 and 81.2% of the isolates were resistant to erythromycin and tetracycline, respectively, and over 10% of them were resistant to gentamicin, tobramycin and rifampicin.    Conclusions  The bacterial flora of healthy children is mainly consisted of Gram-positive bacteria belonging to  Corynebacterium  spp. and  Streptococcus  spp.; most of  S. pneumoniae  isolates were sensitive to antibiotics except erythromycin and tetracycline.

Bacteriological profiles and drug susceptibility of Streptococcus isolated from conjunctival sac of healthy children