Comparative study on bacterial species in conjunctival sac between Qiang minority and Han nationality / 中华实验眼科杂志

ABSTRACT

Background Qiang minority is minority groups of China with the special habits and customs and living condition. So whether the spectrum of disease and bacteria spectrum in conjunctiva are similar with Han nationality is worth paying attention. Objective Present survey was to obtain the data about bacterial species in conjunctival sac in Qiang minority population with the age 40 years old and more and the compare with matched Han nationality population. Methods This survey study was performed as the standardized training and protocol. A total of 212 eyes of 106 individuals from Qiang minority in Beichuan county and 640 eyes of 320 subjects from Han nationality in Mianyang city received questionnaire survey and ophthalmological examination. The secretion of the inferior palpebral conjunctival sac was embrocated and inoculated on blood plate for 48-72 hours. The bacteria was separated and identified. This study was approved by the Ethic Committee of Sichuan Provicial People' s Hospital. Orally informed consent was obtained before the medical procedure. Results All the examinee finished the survey and examination with a good compliance. No significant difference was found in the demography between these two groups of population. The multiple bacterial positive rate in conjunctival sac was 59. 4% in Qiang minority and that of Han people was 66. 3% with a considerably difference between them (χ2 = 2. 27,P = 0. 13). The multiple bacterial species were simultaneously detected in 26.2% in Qiang minority population and 11.88% Han people, showing evidently difference (χ2 = 106. 40, P = 0. 00 ) . The positive rate of corynbaccterium in conjunctival sac of Qiang minority was statistically lower than that of Han people (20. 7% versus 45. 0% ,χ2 =31. 75 ,P = 0. 00) ,but there was no statistical difference in the positive rate of staphylococcus epidemics between two groups (χ2 = 1. 89 ,P = 0. 17). Conclusion The bacteria positive rate in conjunctiva sac is resemble in the population over 40 years in both the Qiang minority and Han nationality. The simple bacterial species is found in majority people in two groups of subjects. The positive rate of multiple bacterial strains coexistence is more in the Qiang minority. The bacterial strains is different between Qiang minority and Han nationality.