If there are few virus particles that lead to an infection, the number of virus particles determines the degree of diversity that can be present within the host.
如果有几个病毒粒子导致感染，病毒粒子的数量决定了在宿主中变异程度。
Recent studies have shown that host immune responses resulting from HBV infection plays an important role in every phase of chronic viral infection.
近来的研究表明，HBV感染引起的宿主免疫应答反应在慢性HBV感染的各个时期起着重要作用。
Recent studies have shown that host immune responses resulting from HBV infection plays an important role in every phase of chronic viral infection.
近来的研究表明，HBV感染引起的宿主免疫应答反应在慢性HBV感染的各个时期起着重要作用。
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