Lacrimal sac bacteriology and susceptibility pattern in infants with congenital nasolacrimal duct obstruction in the 1st year of life: a cross-sectional study.

Infants with CNLDO under 1 year of age presented predominance of Streptococcus as Gram-positive organism, and Haemophilus as Gram-negative organism. Levofloxacin was an active topical antibiotic agent with few chance of resistance especially for Chinese children. These findings could help clinicians choose optimal medicine for CNLDO as the conservative treatments.