avirulent


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Antonyms for avirulent

not virulent

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References in periodicals archive ?
Biotype 1A isolates have generally been regarded as avirulent, but some isolates harboring genes such as ystB.
Differentiation between virulent and avirulent strains of Rickettsia prowazekii by macrophage-like cell lines.
An avirulent lipophosphoglycan-deficient Leishmania major clone induces CD4+ T cells which protect susceptible BALB/c mice against infection with virulent L.
tuberculosis versus avirulent strains involve both TNF production and TNF inactivation by released soluble TNFR2 from activated macrophages [23, 49].
Two of the three Beijing and all the six F15/LAM4/KZN isolates also induced levels of cytotoxicity that were significantly higher than that of the avirulent laboratory strain (H37Ra) (Pless than 0.
burnetii undergoes antigenic phase variation, between a virulent phase I form and an avirulent phase II form.
First clinical results with tumor-cell vaccines modified with live but avirulent Newcastle disease virus.
Recognition of effectors from avirulent strains of P.
shows tRNA modification by GidA is essential for Streptococcus pyogenes virulence, and suggests deletion of genes encoding tRNA modification enzymes as a new strategy to make avirulent strains for use in live-attenuated vaccines [20].
Many infection are silent owing to age of birds (less than 3 weeks old), infection with avirulent field strains or infection in the presence of maternal antibodies [6].
Culture medium is considered a less restrictive reproduction environment than the host, allowing for the development of more genetic variants of the fungus, including less virulent or avirulent derivatives.
Phase II is the avirulent phase which occurs after a series of stages in the laboratory setting.
The bacterium seems to have a virulent and an avirulent form, and as thus far, there is no screening method which can differentiate between the two.
Enterococci, an indigenous flora of the intestinal tract, oral cavity and genitourinary tract of humans and animals, are known to be relatively avirulent in healthy individuals, but have become important opportunistic pathogens, especially in hospitalized patients.