A form of progressive pneumonia in sheep, caused by a lentivirus.
梅迪病呼吸困难（羊的进行性肺炎）。参见VISNA
See also visna
Example sentencesExamples
Maedi and visna are slowly progressive viral diseases.
Norwegian authorities and industries have for years used great efforts and resources to control and eradicate diseases such as bovine virus diarrhoea (BVD) in cattle, and maedi in small ruminants.
Origin
1950s: from Icelandic, literally 'shortness of breath'.