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Host Intraspatial Selection of Infectious Bronchitis Virus Populations

Significance of Findings Evolution of viruses by selection of the fittest subpopulations can lead to the selection of virulent viruses and the emergence of new viral pathogens. It seems reasonable to assume that intraspatial variation is also contributing to this complex phenomenon and to related problems, such as reversion to virulence of attenuated IBV vaccine strains after chicken passages. From an applied perspective, these results strongly suggest that viruses to be used for phylogenetic studies should be obtained from the same tissues of the chickens. Otherwise, intraspatial variation may be adding variation to such data.