EN
In 2006, 725 horses aged 8 months to 16 years from different farms from the southern-eastern part of Poland were examined post-mortem for the presence of botfly larvae. One hundred and four horses (14.75%) demonstrated the presence of botfly larvae. An average infection rate was 52 larvae but low rate dominated. The larvae found belonged to Gasterophilus intestinalis and Gasterophilus nasalis. The 3rd instars dominated in the infected horses; however, more than 25% of the horses harboured both 2nd and 3rd instars.