In addition, the various versions of PPI-1v were shown to impact on virulence differently and suggests that this region is at least partly responsible for the greater virulence of highly virulent isolates compared to less virulent isolates.
"Effects of Proanthocyanidins on Adhesion, Growth, and Virulence of Highly Virulent Extraintestinal Pathogenic Escherichia coli Argue for Its Use to Treat Oropharyngeal Colonization and Prevent Ventilator-Associated Pneumonia".
P58 Effects of Proanthocyanidins on Adhesion, Growth, and Virulence of Highly Virulent Extraintestinal Pathogenic Escherichia coli Argue for Its Use to Treat Oropharyngeal Colonization and Prevent Ventilator-Associated Pneumonia.
After myxoma virus was introduced to control populations of European rabbits that devastated sheep-grazing rangeland in Australia, the virus evolved a somewhat lower level of virulence, apparently because highly virulent virus strains killed their rabbit hosts before mosquitoes could feed and transmit the virus to other rabbits.
Taken together with our in vivo evaluation in the mouse, these data suggest that pili in general might likely be dispensable for the full virulence of this highly virulent invasive isolate.
Thus, although some isolates from groups A and B1 are limited in their virulence gene content and are not likely to be highly virulent, others in these groups contained multiple virulence factors genes that could contribute to extraintestinal virulence.
More importantly, PCN033 presented as a highly virulent ExPEC strain in previous virulence assessment in the mouse model [ 9, 13].
Recently, in an attempt to identify chromosomal variations underlying the different properties of high versus low virulence strains, the genome of the highly virulent strain 8081 [ 12] has been compared to genomes of low virulence strains [ 13, 14].
