Meta-analysis maps human and canine leptospirosis in China

A new systematic review and meta-analysis in Preventive Veterinary Medicine pulls together 109 studies from 29 provinces in China and finds pooled prevalence estimates of 25% for human leptospirosis and 12% for canine leptospiral infection. The review, which included 111,542 human samples and 8,875 dog samples, reports marked variation by geography, time period, and host factors. In people, higher prevalence was generally associated with central China, rural settings, middle age, and higher-exposure occupations. In dogs, higher prevalence was more commonly seen in unvaccinated and free-roaming animals, with Icterohaemorrhagiae predominating in humans and Canicola the most frequently reported serogroup in dogs. The authors caution that the findings describe broad epidemiologic patterns, not proven causal risk factors, because heterogeneity across studies was substantial. (sciencedirect.com)

Why it matters: For veterinary professionals, the paper reinforces leptospirosis as a One Health surveillance issue rather than a narrowly human public health problem. Dogs can shed Leptospira in urine and may continue shedding for up to three months if not fully treated, creating exposure risks for clinic teams, pet parents, and other animals. The China-focused findings also align with broader public health patterns showing persistent human disease in southern China, seasonal peaks from August to October, and a need for stronger local surveillance and diagnosis capacity. (cdc.gov)

What to watch: Watch for whether these findings translate into more targeted canine vaccination, rodent control, and integrated human-animal surveillance efforts in China's endemic provinces. (sciencedirect.com)