Percentage of total N. ceranae transcripts detected over the infection period.

Over 28% of N. ceranae transcripts were detected to express as early as 1 dpi. The expressed transcripts increased dramatically from 42.5% at 2 dpi to 91.5% at 3 dpi, followed by a steady increase to 96.4% at 6 dpi. The largest increase in the expressed transcripts was between 2 dpi and 3 dpi, which might reflect an increase in meront reproduction and sporonts formation.