Listeners needed the space in between to reassort their listening processes and indeed their values.

When influenza successfully infects a new species, it can reassort, and may switch from being an avian to a mammalian one.

Attenuated vaccines will revert to virulence by consecutive passage in chickens in densely populated areas, and may reassort with field strains, generating potentially important variants.

"Contemporary human H3N2 influenza viruses are now endemic in pigs in southern China and can reassort with avian H5N1 viruses in this intermediate host."