"Around 25% of people were seropositive for specific anti-Toxocara antibodies in the UK and Ireland in historical studies of hospital and paediatric populations, while average seroprevalence is 10.5% in Europe and 19.0% globally."
Does this mean that dog-owners on the continent of Europe as a whole are two and a half times as aware as those in the UK of toxocara and are more likely to make sure that their pets are wormed monthly to prevent infection and egg-shedding? Or is it that UK dogs are more likely to be in cities and exercised where people also work and take their leisure (which doesn't absolve dog-owners from their responsibilities with regard to worming)?
"Toxocara eggs contaminating public parks come from infected definitive hosts, including dogs, cats and foxes. In typical UK urban settings, the majority of Toxocara spp. eggs are predicted to come from pet dogs, and the vast majority being T. canis. This is because fox population density is much lower (less than 10 per square km) than that of pet dogs (more than 100 per square km) in UK towns and cities, such that higher prevalence of egg shedding in foxes does not translate into higher overall egg numbers, while cats have lower faecal mass and are also predicted to shed fewer eggs overall than dogs."
Cats also tend to dig holes and cover their excrement, unlike dogs, which are far more likely to just walk off and leave it to their owner.