Abstract: In order to understand the infection and prevalence of Chlamydia among horses in some area of Guangxi province，988 serum samples collected from 12 counties of Baise and Hechi in 2021-2023 were conducted indirect hemagglutination test（IHA）. Results showed that the positive rates of antibody against Chlamydia in horses from Baise and Hechi were 11.62%（65/542）and 12.56%（56/446）respectively，positive rates detected in Tianyang district，Lingyun county and Bama county were relatively high among 12 counties. From 2021 to 2023，positive rates of antibody against Chlamydia in horses were 13.28%（32/241），10.78%（33/306）and 12.19%（54/443），while average positive rates were 12.04%（119/988）in total. Positive rates of antibody against Chlamydia in stallions and mares were 11.49%（55/480）and 12.6%（64/508），showing no significant difference between different genders. Results of this study have enriched the background data on the prevalence of Chlamydia infection among livestock， especially in horse herds，in China.

Key words: Guangxi, equine Chlamydia, serological investigation, IHA

摘要： 为了解广西部分地区马衣原体病的感染及流行情况，2021－2023年间采集百色市、河池市等2个市12个县区988份马血清样品，应用间接血凝（IHA）试验进行衣原体抗体血清学检测。结果显示，百色市马血清衣原体抗体阳性率为11.62%（65/542），河池市马血清衣原体抗体阳性率为12.56%（56/446），其中田阳区、凌云县、巴马县检出的抗体阳性率较高；2021年至2023年，马血清衣原体抗体阳性率依次为13.28%（32/241）、10.78%（33/306）、12.19%（54/443），平均阳性率为12.04%（119/988）；公马与母马的衣原体阳性抗体率分别为11.49%（55/480）、12.6%（64/508）。该研究结果丰富了我国广西部分地区畜间尤其是马群中衣原体感染的流行本底数据。

关键词: 广西, 马衣原体, 血清学调查, 间接血凝试验（IHA）