In order to understand the causes of the low virulence of Listeria monocytogenes field strains, five low-virulence strains were analysed. These five strains showed changes in relation to invasion, phosphatidyl-inositol phospholipase C (PI-PLC) activity, plaque formation and in vivo virulence.
mic.sgmjournals.org/cgi/content/full/154/3/939
With regard to low- virulence organisms present in the female lower genital tract, we are beginning to identify some of their virulence attributes. ...
www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2364... www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2364362
Several reports have described Listeria monocytogenes strains which were nonpathogenic or weakly pathogenic, but little is known about these low-virulence strains.
iai.asm.org/cgi/content/abstract/71/6/3429
All viruses were determined to be of low virulence and of low potential to cause disease in poultry. The analysis of the genetic sequence of these viruses revealed that most of the WS viruses and all of the LBM viruses were significantly divergent from virulent viruses.
www.ars.usda.gov/research/publications/publications.htm... www.ars.usda.gov/research/publications/publications.htm?seq_no_115=209502
Organs during the early stages of infection (from 2 to 7 days) had virus isolation from all three groups only on day 7. Virus titer in kidney and heart sampled at day 25 was higher for the two virulent isolates compared with the low-virulence isolate.
www.medscape.com/medline/abstract/15657267
Several models have shown that virulence varies from one strain of Listeria monocytogenes to another, but little is known about the cause of low virulence. ... These genetic modifications could explain the low virulence of group I strains, since mutated PrfA proteins were inactive. Group II and III strains entered cells but...
www.medscape.com/medline/abstract/16204519
The course of infection after the intracerebral inoculation of high-virulence and low-virulence strains of Bordetella pertussis into mice was followed by making serial viable counts of the number of bacteria in the brain.
jmm.sgmjournals.org/cgi/content/abstract/3/1/1
Thus far, biotyping and phage-typing were used to differentiate between high virulence and low virulence S. aureus strains in rabbits. ...
linkinghub.elsevier.com/retrieve/pii/S0378113599001972
Burkholderia - Burkholderia cepacia is an aerobic gram-negative bacillus found in a variety of aquatic environments. ... B cepacia is an organism of low virulence and is a frequent colonizer of fluids used in the hospital (eg, irrigation solutions, intravenous [IV] fluids). B cepacia rarely causes infection in healthy hosts.
www.emedicine.com/med/topic3459.htm
strains of low virulence from voles. This latter report is of particular interest since strains of ... hand, were initially of low virulence but could be ...
www.ajtmh.org/cgi/reprint/12/2/215.pdf