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Topic: Virulence



  
 The Evolution and Maintenance of Virulence in Microparasites
However, increased virulence in a passage experiment is not sufficient evidence for that trade-off.
According to the coincidental evolution hypothesis, it is possible that the virulence determinant responsible for morbidity and mortality in the host provides a local advantage to the parasite expressing it; whether it does or not could be tested with competition experiments between strains of that microparasite that are isogenic save for that virulence determinant.
The enlightened view on the virulence of microparasites sometimes takes the positive association between the virulence of a microparasite and its transmissibility as axiomatic; therefore, it assumes that a microparasite’s virulence is constrained solely by the need to keep the host alive to facilitate its transmission to new hosts.
http://www.cdc.gov/ncidod/eid/vol2no2/levin.htm   (5891 words)

  
 Attenuation of Pseudomonas aeruginosa virulence by quorum sensing inhibitors -- Hentzer et al. 22 (15): 3803 -- The ...
Attenuation of Pseudomonas aeruginosa virulence by quorum sensing inhibitors -- Hentzer et al.
http://embojournal.npgjournals.com/cgi/reprint/22/15/3803   (13 words)

  
 VIRULENCE OF METARHIZIUM ANISOPLIAE TO EMBRYOS OF THE GRASS SHRIMP PALAEMONETES PUGIO
In one of the initial experiments an increase in N-acetyl--D-glucosaminidase, EC 3.2.1.30, (NAGase) activity accompanied by an increase in virulence toward shrimp embryos was observed.
Our measurements of the enzymatic activities on the conidiospores, however, go on to suggest that changes in activities of these cuticle-degrading enzymes may correlate with changes in virulence of this fungus toward a nontarget organism.
Additional experiments in which conidiospores were produced on homogenized caterpillars suggested a positive correlation between virulence of M.
http://www.nbiap.vt.edu/brarg/brasym95/genthner95.htm   (3643 words)

  
 EID Vol 2 No 4: Guarding Against the Most Dangerous Emerging Pathogens: Insights from Evolutionary Biology
The evolutionary effects of changes in sexual behavior on virulence may be strongly influenced by tropisms that were present before the behavior change.
The association between virulence and viral propagation in pathogens circulating naturally in human populations therefore supports the modern emphasis on a tradeoff between the fitness benefits and the costs accrued by pathogens as a function of changes in host exploitation.
Evidence for a role of virulent human immunodeficiency virus (HIV) variants in the pathogenesis of acquired immunodeficiency syndrome: Studies on sequential HIV isolates.
http://www.cdc.gov/ncidod/EID/vol2no4/ewald.htm   (6955 words)

  
 Interactions among Strategies Associated with Bacterial Infection: Pathogenicity, Epidemicity, and Antibiotic ...
and virulence as a consequence of the expression of a resistance
isolates were analyzed, such reduced virulence was not found.
A critical point to discuss here is that virulence and/or antibiotic
http://cmr.asm.org/cgi/content/full/15/4/647   (9382 words)

  
 A Ferret Model of Canine Distemper Virus Virulence and Immunosuppression -- von Messling et al. 77 (23): 12579 -- The ...
The recovery of a recombinant wild-type MV with retained virulence
Animals were immunized against tetanus prior to the experiment, and a positive DTH response (diameter of induration,
a certain degree, but they reproduce only some aspects of MV pathogenesis and virulence.
http://jvi.asm.org/cgi/content/full/77/23/12579   (6766 words)

  
 Potential Role of Phospholipases in Virulence and Fungal Pathogenesis -- Ghannoum 13 (1): 122 -- Clinical Microbiology ...
is thought to be an important virulence determinant in C.
Potential Role of Phospholipases in Virulence and Fungal Pathogenesis -- Ghannoum 13 (1): 122 -- Clinical Microbiology Reviews
their study presents further evidence in support of PLB as a virulence
http://cmr.asm.org/cgi/content/full/13/1/122   (8873 words)

  
 Multiple Determinants Contribute to the Virulence of HSV Ocular and CNS Infection and Identification of Serine 34 of ...
virulence changes increases the importance of further studies
virulence greater than background, but did not reach our stringent
However, in nature, the virulence of any given
http://www.iovs.org/cgi/content/full/44/6/2657   (7620 words)

  
 What Makes Cryptococcus neoformans a Pathogen?
The first comprises the basic characteristics needed to establish an infection and survive in the human host; the second comprises the virulence factors that affect the degree of pathogenicity.
Although we have learned much about the pathogenicity and virulence of C.
Virulence factors increase the degree of pathogenicity of a microbe.
http://www.cdc.gov/ncidod/EID/vol4no1/buchanan.htm   (6683 words)

  
 Reexamining the Role of the Accessory Plasmid pAtC58 in the Virulence of Agrobacterium tumefaciens Strain C58 -- Nair ...
of metabolic pathways, their possible role in the virulence
There are several means by which pAtC58 could be involved in
Our studies indicate that pAtC58 has a positive effect on vir
http://www.plantphysiol.org/cgi/content/full/133/3/989   (6325 words)

  
 Clonal Origin, Virulence Factors, and Virulence -- Johnson et al. 68 (1): 424 -- Infection and Immunity
Virulence and transmissibility of pathogens: what is the relationship?
associated with virulence in this study was suggested by the finding
concept is consistent with the traditional "virulent clone" hypothesis
http://iai.asm.org/cgi/content/full/68/1/424   (1198 words)

  
  DukeMedNews Common Worm Provides Insights Into Salmonella Virulence
Aballay believes that this model opens news areas of research for better understanding the relationship between pathogens and host responses.
"But with the identification of the targeted pathways in the host, we should be able to figure out how virulence factors influence the innate immune response."
Aballay said that the C elegans system could be an effective living model for testing or screening new compounds or drugs for treating Salmonella in humans.
http://dukemednews.org/news/article.php?id=7647   (897 words)

  
 Bacteriophage Control of Bacterial Virulence -- Wagner and Waldor 70 (8): 3985 -- Infection and Immunity
This relationship may be of benefit to phages as well.
The most widely recognized examples of phage-encoded virulence
Transduction of drug resistance to tetracycline, chloramphenicol, macrolides, lincomycin and clindamycin with phages induced from Streptococcus pyogenes.
http://iai.asm.org/cgi/content/full/70/8/3985   (5504 words)

  
 Virulence in Listeria Monocytogenes
This is thought to be due to the fact that both these conditions would be found inside phagosomes of activated macrophages
Many other factors are thought to influence virulence regulation in L.monocytogenes, including:
It is therefore thought that there may be pH-dependent and pH-independent components.
http://www.ucs.mun.ca/~z72kaa/otherfactors.html   (317 words)

  
 The DEAD-box RNA helicase Vad1 regulates multiple virulence-associated genes in Cryptococcus neoformans -- Panepinto et ...
One approach for the study of virulence regulation has been
although the role of this pathway in virulence also appears
to model cryptococcal virulence on signal transduction pathways
http://www.jci.org/cgi/content/full/115/3/632   (6559 words)

  
 A Genomic Sample Sequence of the Entomopathogenic Bacterium Photorhabdus luminescens W14: Potential Implications for ...
virulence factors as a prelude to a functional analysis of the
that the virulence factors present in invertebrate pathogens may
toxins are cytolytic toxins that are virulence factors in many
http://aem.asm.org/cgi/content/full/66/8/3310   (6754 words)

  
 Ethical Criticism of Art [Internet Encyclopedia of Philosophy]
Stow, S., "Unbecoming Virulence: The Politics of the Ethical Criticism Debate," Philosophy and Literature, (Vol.
Suggests ways in which the debate between Posner, Nussbaum and Booth over the ethical criticism of art was heavily influenced by their respective political differences.
http://www.iep.utm.edu/a/art-eth.htm   (8958 words)

  
 Virulence of Enteropathogenic Escherichia coli, a Global Pathogen -- Clarke et al. 16 (3): 365 -- Clinical Microbiology ...
virulence mechanisms associated with EPEC and some of the more
of TypA may play a role in EPEC virulence.
however, the virulence mechanisms of EPEC have become better
http://cmr.asm.org/cgi/content/full/16/3/365   (8905 words)

  
 Ether Phospholipids and Glycosylinositolphospholipids Are Not Required for Amastigote Virulence or for Inhibition of ...
upon LPG and phosphoglycans for virulence probably due to interactions
in virulence and the specific mechanisms by which these act
of molecules implicated in virulence, such as lipophosphoglycan
http://www.jbc.org/cgi/content/full/278/45/44708   (5574 words)

  
 Medmicro Chapter 7
Virulence is the measure of the pathogenicity of an organism.
Virulence factors should never be considered independently of the host's defenses; the clinical course of a disease often depends on the interaction of virulence factors with the host's response.
Rather, they provide the opportunity for resistant bacteria to proliferate and produce other virulence factors in patients who are being treated with an inappropriate antibiotic.
http://gsbs.utmb.edu/microbook/ch007.htm   (6414 words)

  
 Virulence Testing of Listeria monocytogenes
However, clinical isolates included in such studies are not consistently more virulent than food isolates with no known human disease association.
Where multiple serotypes or ribotypes are compared, it has been difficult to demonstrate a consistent pattern of increased virulence associated with any subtype(s) in animal or in vitro studies.
Animal studies and cell culture systems show a range of virulence among food isolates of L.
http://www.aoac.org/pubs/JOURNAL/2002/Mar_Apr/Virulence_Testing.htm   (334 words)

  
 Virulence - Wikipedia, the free encyclopedia
Colonization of the stomach lining by this bacterium can lead to Gastric ulcer and cancer.
Helicobacter pylori is able to survive in the acidic environment of the human stomach by producing the enzyme urease.
Virulent viruses such as the AIDS virus (HIV) have mechanisms for evading host defenses.
http://en.wikipedia.org/wiki/Virulence   (561 words)

  
 Virulence Factors of Helicobacter pylori Responsible for Gastric Diseases in Mongolian Gerbil -- Ogura et al. 192 (11): ...
Virulence Factors of Helicobacter pylori Responsible for Gastric Diseases in Mongolian Gerbil
Virulence Factors of Helicobacter pylori Responsible for Gastric Diseases in Mongolian Gerbil -- Ogura et al.
Evaluation of the Association of Nine Helicobacter pylori Virulence Factors with Strains Involved in Low-Grade Gastric Mucosa-Associated Lymphoid Tissue Lymphoma
http://www.jem.org/cgi/content/abstract/192/11/1601   (1469 words)

  
 virulence
This toxin plays a primary role in toxicity in localized tissues and is positively regulated by the sar-agr dependent pathway.
This confirms that sigB is both a regulator and is in turn regulated in its action on expressing virulence factors.
The Ultimate Effect of SarA action on virulence
http://www.ucs.mun.ca/~b66msp/virulence.htm   (993 words)

  
 Virulence Factors
In essence, a virulence factor is any moiety produced by a pathogen that is essential for causing disease in a host.
According to current literature, bacterial virulence factors can be roughly divided into several groups, based on the mechanism of virulence and function [6].
Finlay and Falkow, in their 1997 review [2], discuss the various definitions of microbial pathogenicity, and the idea that pathogens can be distinguished from their non-virulent counterparts by the presence of such virulence genes.
http://www.jenner.ac.uk/BacBix3/PPvir_facs.htm   (2358 words)

  
 MODULATION OF VIRULENCE FACTORS
These factors contribute to the virulence of the microorganisms and to their survival in the hostile envirnoment within the body of their host.
Bacteria which cause disease have special factors which are designated as virulence factors.
Yersinia includes such virulent bacteria as Yersinia pestis (1), the cause of plague, as well as Yersinia enterocolitica (1,2, 3) and Yersinia pseudotuberculosis (1)which both cause gastrointestinal infection.
http://bioscience.org/news/scientis/virulenc.htm   (413 words)

  
 Merriam-Webster Online
virulence of a disease> c : the relative capacity of a pathogen to overcome body defenses
: the quality or state of being virulent : as a : extreme bitterness or malignity of temper :
For More Information on "virulence" go to Britannica.com
http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=virulence   (81 words)

  
 Download VIRULENCE Mp3
The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system.
The ads below may lead you to mp3 sites independent of searchlyrics.org, offering more examples of Virulence links found using freely available software downloads.
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http://www.searchlyrics.org/virulence/download_mp3.html   (132 words)

  
 PNAS -- Table of Contents (Aug 1 2000, 97, (16))
Lipophosphoglycan is a virulence factor distinct from related glycoconjugates in the protozoan parasite Leishmania major
Virulence and Defense in Host-Pathogen Interactions: Common Features Between Plants and Animals
COLLOQUIUM: Virulence and Defense in Host-Pathogen Interactions: Common Features Between Plants and Animals
http://www.pnas.org/content/vol97/issue16/index.shtml   (3278 words)

  
 Helicobacter pylori adherence to gastric epithelial cells: a role for non-adhesin virulence genes -- ZHANG et al. 51 ...
adhesins, other bacterial virulence factors such as CagE, CagP,
Helicobacter pylori adherence to gastric epithelial cells: a role for non-adhesin virulence genes -- ZHANG et al.
Helicobacter pylori adherence to gastric epithelial cells: a role for non-adhesin virulence genes
http://jmm.sgmjournals.org/cgi/content/abstract/51/6/495   (408 words)

  
 Holistic Health Encyclopedia - E
Pat, I know that this doesn't really answer your question but I feel the key thing to understand in this whole EBV thing is that symptoms are a function of the immune system of the host -- assuming that the virulence of the microorganism (in this case EBV) is constant.
In my own case I developed mono in my early 20's upon moving from Louisville to Philadelphia to accept my first post-college job.
http://www.findhealer.com/glossary/E.php3   (7235 words)

  
 The Virulence Plasmid of Yersinia, an Antihost Genome -- Cornelis et al. 62 (4): 1315 -- Microbiology and Molecular ...
Paton, A. W., Srimanote, P., Woodrow, M. C., Paton, J. Characterization of Saa, a Novel Autoagglutinating Adhesin Produced by Locus of Enterocyte Effacement-Negative Shiga-Toxigenic Escherichia coli Strains That Are Virulent for Humans.
Mecsas, J., Bilis, I., Falkow, S. Identification of Attenuated Yersinia pseudotuberculosis Strains and Characterization of an Orogastric Infection in BALB/c Mice on Day 5 Postinfection by Signature-Tagged Mutagenesis.
Gall, T. L., Mavris, M., Martino, M. C., Bernardini, M. L., Denamur, E., Parsot, C. Analysis of virulence plasmid gene expression defines three classes of effectors in the type III secretion system of Shigella flexneri.
http://mmbr.asm.org/cgi/content/abstract/62/4/1315   (3974 words)

  
 VIRULENCE Lyrics
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http://www.searchlyrics.org/virulence   (240 words)

  
 VENEZUELAN EQUINE ENCEPHALITIS VIRUS IN THE GUINEA PIG MODEL: EVIDENCE FOR EPIZOOTIC VIRULENCE DETERMINANTS OUTSIDE THE ...
Envelope Glycoprotein Mutations Mediate Equine Amplification and Virulence of Epizootic Venezuelan Equine Encephalitis Virus
IVORLYNE P. Center for Biodefense and Emerging Infectious Diseases, Department
VENEZUELAN EQUINE ENCEPHALITIS VIRUS IN THE GUINEA PIG MODEL: EVIDENCE FOR EPIZOOTIC VIRULENCE DETERMINANTS OUTSIDE THE E2 ENVELOPE GLYCOPROTEIN GENE -- GREENE et al.
http://www.ajtmh.org/cgi/content/abstract/72/3/330   (473 words)

  
 Herbal Encyclopedia - E
As a safeguard, persons are recommended to make a magic circle, in the centre of which they should stand, with Elderberries gathered on St. John's night.
'On Bertha Night (6th January), the devil goes about with special virulence.
http://www.fortunecity.com/roswell/chaney/191/id105.htm   (16053 words)

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