Fig. 1From: Successful eradication of Mycoplasma hyopneumoniae from the Norwegian pig population – 10 years laterNumber of Norwegian pig herds tested per year, and the proportion of Mhyo positive herds. Legend: Number of Norwegian pig herds tested per year between 1994 and 2009, and the proportion of herds positive for antibodies against Mycoplasma hyopneumoniae (Mhyo). Most herds were tested more than onceBack to article page