The strain the animals have contains a mutation allowing it to more easily transmit between mammals. It is also a different variation than the ones found in dairy cows and commercial poultry. This one is Eurasian in origin, first seen in 2022. It has been detected in birds that fly along the Pacific Flyway, and is responsible for a mass mortality event in 2023 in northern fur seals on an island in eastern Russia.
During a routine exam, veterinarians found Baylisascaris eggs in the dog's system - the first such formal report of raccoon roundworm in a dog in county history, according to a Los Angeles County Department of Public Health news release. In 2024, two South Bay residents were sickened by the parasite, which can infect the brain, spinal cord and eyes and lead to eye disease and swelling of the brain.
