Figure 5 shows that genes under selection tend to be in valleys of low Tajima's D values, consistent with a recent selective sweep in that region. We found nine genes below the 5% quantile of Tajima's D values (−4.432), eight of which are in the envelope production, replication, host infection, or transcription category, with one hypothetical protein gene. Again, helicase, IAP-2, and Env-Prot were found among the selected genes (Fig. 5B). The gene discussed is BIRC2; the disease is infection.