The Echinococcus multilocularis tapeworm is becoming more prevalent in North America, with rapid expansion in the northeastern United States. Wild and domestic canid species serve as definitive hosts, with rodents being intermediate hosts.
E. multilocularis proglottids are microscopic, making annual fecal flotations using centrifugation important for early identification of this parasitic infection. Brian Herrin, DVM, PhD, notes the heavy eggs do not float with a passive flotation and recommends following up a centrifugal fecal float by administering a PCR test designed for Echinococcus spp if an infection is suspected.
Source: DVM 360, March 4, 2025. Link. Prevention of E multilocularis may be achieved by educating veterinary teams and clients, and having pets avoid the ingestion of canid feces.
Also see: E. multilocularis in dogs: North America, Worms & Germs, October 23, 2024. Link.
INSIGHTS: While flotation is important, avoid letting dogs ingest canid feces, a difficult challenge considering how readily wild canids and domestic dogs cross paths in suburban and urban areas. Red and gray foxes, as well as coyotes, are common backyard nocturnal visitors.