QDA是从海水中发现的产生褐藻多糖的细菌，无致病性。
QDA, which was isolated from seawater, has the ability of yielding alginate.
益生菌是一类对宿主机体健康有益的低致病性或无致病性微生物。
Probiotics have been defined as living microorganisms with low or no pathogenicity that exert beneficial effects on the health of the host.
经对继代毒的毒力测定和抗原稳定性试验证明，53 - 73代毒对狐无致病性，而且毒力稳定。
Viruleut and 'antigen stability of passages CAV-2 showed that passage 53-73 viruses hod no pathogenicity for fox, but virulence was stable.
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