Bacteriological profile of conjunctiva bacterial Flora in Northeast China: a hospital-based study

Abstract

Abstract Purpose To investigate the distribution and influencing factors of preoperative conjunctival flora from patients undergoing penetrating ocular surgeries in northeast China. Methods An observational and cross-sectional study design was used. In 305 eyes of 305 patients without infective eye diseases who underwent ocular surgeries at the First Affiliated Hospital of Harbin Medical University between May 2018 and May 2019, conjunctival sac scrapings were collected on the day before surgery. Results The mean age of the participants was 60.73 ± 14.23 years, with the majority being female, married and unemployed with at least primary school education. The positive culture rate was 48.20% (147/305 eyes), and 191 bacterial strains were isolated; two or more strains were isolated from 22.45% (33/147) of positive samples. The most commonly isolated bacteria was Staphylococcus epidermidis (64.92%), surpassing Staphylococcus aureus (5.76%). The culture positive rate of the young (18–40 years) group was different between the females (26.67%) and males (69.23%) (P = 0.024), but in the middle-aged group and the elderly group, the rates between the sexes were similar, with an increasing trend. Patients who visited in summer or autumn presented a higher positive rate than other seasons. Hypertensive women had a higher rate than hypertensive men (58.14% vs. 40%, χ2 = 5.8662, P = 0.0154). Conclusions In northeastern China, coagulase-negative Staphylococcus were the most common preoperative conjunctival bacteria. Hypertensive female patients, elderly patients, or those operated on in the summer and autumn should pay more attention to perioperative treatment. Trial registration ChiCTR2100044659 .

Keywords

• Conjunctival bacterial flora
• Sex
• Seasonal changes
• Northeastern China