The group of host animals in which all influenza viruses arose are birds. All viruses isolated in different groups of animals (e.g. pigs, horses, etc) had all their origin in birds (as indicated by the blue lineages).
All influenza viruses originated in the group of host animals known as birds. All viruses discovered in various animal species (such as pigs, horses, etc.) originated in birds (as indicated by the blue lineages).
Flu virus proteins are probably present in the nucleus, host cell membrane, and cytoplasm during an influenza virus infection. The genome type of an animal virus mostly determines the type of life cycle it has. A prophage can be formed by a lambda phage; a retrovirus would be a similar animal virus type. Some hosts manufacture interferons to protect themselves from animal viruses.
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