The rarity of these diseases creates challenges both from a scientific and an economic viewpoint.
That way, action can be taken promptly and the disease can be isolated and stopped from spreading.
This is a major step forward, particularly with regard to rare diseases.
Then when he comes home, he infects his wife and brings the disease into the village.
Although the virus has been found in other species, the disease itself is so far confined to salmon.
Disease is a luxury which no one can afford.
