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Table 1 Stud farm data and prevalence of Parascaris spp. egg excretion before and after ivermectin (IVM) treatment

From: A survey of ivermectin resistance in Parascaris species infected foals in south-eastern Poland

FarmHerd sizeFoalsSex F/MAge [3/4/5/6 months]FEC-positive foalsEPG (min–max)IVM efficacya
Pre/with EPG ≥ 150PostPrePostObserved FECR
1≥ 1004934/156/14/10/1923/2220471 (50–1050)400 (50–900)57.0 [36.9–74.2]
2≥ 1004026/147/10/9/1428/24202134 (50–13,750)1355 (100–5150)56.8 [20.3–80.3]
3≥ 1005135/164/11/17/1916/1516572 (50–1400)341 (50–2050)44.0 [6.8–74.5]
450–1002414/104/5/6/97/32850 (50–5300)200 (50-350)
5≤ 50169/73/0/7/612/84833 (50–5550)325 (100-650)86.6 [44.8–96.4]
650–100340/340/10/6/186/41167 (100–250)50
7≤ 50117/41/3/5/27/61471 (50–1050)5096.9 [92.9–100.0]
Total 225125/100 99/8264   
  1. F female, M male, FEC faecal egg count, EPG eggs per gram faeces
  2. aObserved faecal egg count reduction (Observed FECR) with 95% confidence intervals given in square brackets