Immunostaining characterization and percentage of H5N1-positive cells of hNPCs following virus infection.

<p>Virus antigens were distributed within the cytoplasm and the nucleus of the infected cells (<b>A-C</b>), with peak percentage of virus-positive cells about 75% at 24 hpi, then declined to about 30% at 72 hpi (<b>D</b>). Scale bar in A-C ≈ 30 μm. Data represented are the mean ± standard error. Asterisks indicated statistically significant differences (<i>p</i>-value<0.05).