Mosaic virus is rarely, if ever, fatal,in its self. It can weaken plants,so that they are attacked by other pathogens.The plants also can become such poor perfomers that they will be discarded. Some varieties have much more resistance than others,and will grow and bloom quite well,while the insects transfer the disease from it to other plants.The other plants may not do so well.
GW owns posted poctures, so I have them elswhere. They also won't allow url links to the site or mention of competitors.
If you input Mosaic virus , TMV or Hippeastrum Mosaic virus to a search engine,there is much tu be learned.
Del

Phil,
Not only is the pattern of a heavily infected plant unattractive on the leaves, but as Del said, the bulb will development many other problems. With time, the leaves may grow out twisted and malformed.

Check out this forum too for much discussion on virus. Use the search feature on the first page.
K