Meta-analysis maps human and canine leptospirosis risk in China

A new meta-analysis in Preventive Veterinary Medicine argues that leptospirosis remains a meaningful shared health threat for people and dogs in China, even after decades of progress in disease control. The June 2026 paper reviewed 109 studies from 29 provinces and estimated pooled prevalence at 25% in humans and 12% in dogs, positioning the disease as an ongoing One Health surveillance issue rather than a resolved historical problem. (sciencedirect.com)

That conclusion lands against a backdrop of long-term decline in reported human leptospirosis in China, but not disappearance. China has classified leptospirosis as a notifiable infectious disease since 1955, and historical analyses show major reductions in incidence over time as hygiene, reporting, and control systems improved. Still, more recent public health literature from China CDC and local surveillance work in places such as Guangzhou shows that sporadic cases and smaller outbreaks continue to occur, particularly in central and southern regions with environmental conditions that support transmission. (pmc.ncbi.nlm.nih.gov)

The new review is notable because it synthesizes evidence across both human and canine populations, rather than treating them separately. According to the abstract and article highlights, the authors searched six databases through November 11, 2025, and assessed epidemiologic patterns and associated factors across a large sample base. Their findings suggest that risk in humans is not evenly distributed: geography, age, occupation, and rural residence all shaped infection patterns. The authors say the results support targeted vaccination and surveillance in endemic areas, which is a practical signal for regional rather than one-size-fits-all control strategies. (sciencedirect.com)

The dog side of the analysis is especially relevant for veterinary readers because canine leptospirosis in China has been documented in regional studies, including recent seroepidemiologic work from Changchun and the Yangtze River region. Those studies point to measurable exposure in dogs and underscore their relevance as sentinels, and in some settings, potential contributors to environmental contamination. More broadly, CDC guidance emphasizes that leptospirosis risk in dogs is not limited to rural settings; exposure can occur in urban, suburban, and rural environments through wildlife, standing water, and contact networks involving other dogs. (mdpi.com)

Direct outside commentary on this specific paper appears limited so far, but the broader expert consensus is moving in the same direction. A 2024 expert consensus paper on enhanced One Health surveillance for key infectious diseases called for more integrated systems linking human, animal, and environmental data. Recent reviews in zoonotic disease surveillance in China have made similar arguments, including explicit recommendations to connect national notifiable disease reporting with animal epidemic and environmental risk data. That aligns closely with the new meta-analysis’ message: fragmented surveillance may miss how leptospirosis actually moves across species and settings. (pubmed.ncbi.nlm.nih.gov)

Why it matters: For veterinarians and veterinary public health teams, this paper is less about a surprise spike and more about a reminder that leptospirosis can stay clinically and operationally important even when headline incidence is low. A pooled canine prevalence of 12% across the reviewed literature suggests ongoing exposure pressure, which has implications for diagnostic suspicion, PPE and clinic infection-control conversations, rodent and environmental risk counseling, and vaccine discussions with pet parents where products and guidelines support use. It also supports the role of veterinary data in broader zoonotic surveillance, particularly in regions where human risk clusters overlap with dog exposure. (sciencedirect.com)

What to watch: The next important questions are whether Chinese surveillance programs or follow-up studies translate these pooled findings into province-level risk maps, serogroup trends, and more actionable guidance on vaccination, diagnostics, and coordinated reporting across human and animal health systems. (sciencedirect.com)