Narrowed host ranges do not constrain future host range expansion in RNA phage Φ6.

Abstract excerpt

RNA viruses frequently shift between different host species and emerge on novel hosts. Part of this evolutionary process can involve specialization, when viruses adapt to increase their fitness on a particular host, often at the expense of their ability to infect other hosts. This trajectory has the potential to lead to extreme host narrowing, which excludes all other previously accessible hosts. The consequences...

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