Gasterophilus intestinalis infections in horses in Belgium.

The study investigated infections caused by the parasite Gasterophilus intestinalis in horses in Belgium over a year. It found that more than half of the examined horse stomachs were infected, with most having under 50 larvae and mares being more frequently infected than stallions or geldings.

Research Context

• This research article is centered around the exploration of infections caused by a specific parasite – Gasterophilus intestinalis – in horses in Belgium. The authors of this paper conducted their research over a year, from December 1995 to November 1996.

Data Collection & Results

• The research focused on tracking the prevalence and intensity of the parasite infection. Over the course of the study, horse stomachs were examined in two Belgian slaughter houses. Out of 330 horse stomachs that were looked at, larvae of Gasterophilus intestinalis were found in 193, accounting for 58% of the total.
• When excluding the statistics for August, the prevalence increased to 62%. No other species from the Gasterophilus genus were identified.
• The monthly prevalence was observed to be as low as 9% in August and as high as 75% in November and December.
• The average count of bot larvae in the infected horses varied each month, from as few as 8 in August to as many as 29 in March.
• Most of the horses (67%) had less than 50 larvae present. Mares were found to be most commonly infected compared to stallions and geldings, with a statistically significant result (P < 0.014).

Conclusions and Implications

• This research showcases not only the widespread incidence of Gasterophilus intestinalis infections in horses in Belgium but also the varying intensity of these infections at different times of the year.
• The majority of infected horses were found to carry fewer than 50 parasite larvae, suggesting that in most cases, the infection may be relatively mild.
• Significantly, it was observed that mares were more frequently infected than stallions and geldings, indicating a potential sex-related difference in susceptibility to this infection.
• The authors also noted changes in the size of the lesions associated with the infection, increasing from 1 cm2 to 17 cm2, and that the majority of larvae were located near the margo plicatus (a characteristic ridge in the horse’s stomach).