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 (ā-vîr′yə-lənt, ā-vîr′ə-)
Not virulent.

a·vir′u·lence n.


(Microbiology) (esp of bacteria) not virulent


(eɪˈvɪr yə lənt, eɪˈvɪr ə-)

(of microorganisms) having lost virulence; no longer pathogenic.
a•vir′u•lence, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.avirulent - not virulent; unable to produce disease
virulent - infectious; having the ability to cause disease
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References in periodicals archive ?
A preliminary study of the SAG2 gene, using restriction fragment length polymorphism (RFLP) method with HhaI restriction enzyme (Sibley and Boothroyd, 1992), found two alleles at this locus, including virulent specific and avirulent specific.
enterocolitica biotype IA (1 of the 6 biotypes) lack the pYV plasmid and the major chromosomal determinants of virulence and, thus, have been regarded as avirulent (2).
It was found that rice blast incidence can be reduced by mass vaccination method with avirulent isolates of M.
The Trichoderma species are useful avirulent plant symbiots that act as bio control agent against phytopathogenic fungi via mechanisms of competition, rhizophere competence, mycoparasitism, antibiotic and enzyme production, induced resistance, and promoting plant growth [13, 14,15].
An avirulent Salmonella Typhimurium LT2 was grown in 10 ml of tryptic soy broth supplemented with 100 mg per ml of rifampicin at 37[+ or -]2 C for 24 hours, and sub-cultured twice before centrifugation.
prowazekii, but they markedly restrict the growth of the avirulent Madrid E strain (Turco and Winkler 1982).
Use of temperature-sensitive avirulent clones of parasite for vaccination purposes.
Subsequently, attached bacteria develop a biofilm which enhances genes transfer between bacterial strains and convert avirulent strains into extremely potent pathogens (Montgomery & Kirchman, 1994; Benhamed et al.
Using human monocytes and macrophages and macrophage cell lines, it has been shown that avirulent strains of mycobacteria induce higher levels of apoptosis than virulent strains which represent a mechanism of host defense which can be subverted by virulent M.
tuberculosis H37Rv (ATCC 27294) and H37Ra (ATCC 25177) were included as virulent and avirulent controls respectively.
Virulent but not avirulent Mycobacterium tuberculosis can evade the growth inhibitory action of a T helper 1-dependent, nitric oxide Synthase 2-independent defense in mice.