XK and influenza: In infected C57BL/6J mice, expression signals from influenza genes strongly decreased on day 8 p.i. and were at baseline levels of mock-treated controls on day 14 p.i. Expression levels of influenza transcripts were higher in DBA/2J mice compared to C57BL/6J mice at days 1 and 3 p.i. Most influenza RNA segments revealed a similar relative increase in expression, except for the segment encoding the neuraminidase (‘NA’) showing a lower increase compared to all other segments.