Epidemiology of Trichinella infection in the horse: the risk from animal product feeding practices.

The research focuses on the occurrence of Trichinella infection in horses in Serbia due to practices of feeding them animal products. A significant portion of horses even consume meat, which might pose risks to public health given the parasites can be passed on to humans. However, current testing methods aren’t reliable, and feeding practices need scrutiny for the sake of animal and human safety.

Background and Objective

• The research was initiated in 2002 when a horse infected with Trichinella spiralis, a meat-borne parasite, was discovered in Serbia.
• Though horses are typically herbivores, instances of human outbreaks caused by consuming infected horse meat have been reported since the 1970s.
• The objective of the study was to understand how horses contract the infection and to assess the risk of such practices to public health.

Methodology

• The investigators traced back the infected horse to its farm owner, and through interviews, deduced that the owner used food waste, potentially including animal products, as feed.
• An expanded study interviewing more horse producers confirmed such feeding practices were prevalent.
• Then a series of trials were conducted to confirm whether horses would willingly eat meat, with the result being affirmative for 32% of the tested horses.
• To replicate the natural infection process, 3 horses were fed infected pork meat, all of which became infected.

Findings

• The experiment found that a significant number of horses in Serbia would eat meat willingly if offered.
• It was also discovered that infected horses maintained a low infection level (larvae per gram of meat) over time.
• Test results proved unreliable, as current testing methods could not detect the infection consistently.

Implications and Conclusions

• The study suggested that feeding practices involving food waste including meat can lead to Trichinella infection in horses, which could be transmitted to humans through horse meat.
• Current inspection procedures seem insufficient and might need modification for better detection of the infection rate.
• The widespread practice of feeding horses animal products requires greater oversight by veterinary and food safety authorities.
• Regulations should be established to ensure the safety of such feeds.

Overall, the research highlights an important public health issue, requiring immediate attention towards horses’ feeding practices and improvement in testing and surveillance mechanisms for Trichinella infection.