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        Distribution of the fish parasite as reported in Hoffman, G. L. 1990. Myxobolus cerebralis, a worldwide cause of salmonid whirling disease. Journal of Aquatic Animal Health 2: 30–37. Map made by  en:User:Vardion and modified by  en:user:Petaholmes and  en:user:Anilocra. PNG-optimized by  John Owens  (talk).
        Parasite discovered in Norway in 1971 Hastein, T. 1971. The occurrence of whirling disease (Myxosomiasis) in Norway. Acta Veterinaria Scandinavica 12:297-299
        
         
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      Schools Wikipedia has been carefully checked to give you the best learning experience. SOS Childrens Villages helps those who have nothing and no one, giving them back the famly they have lost and bringing them the very best opportunities for a happy, healthy future. Find out how you can help children in other countries.