Table 1. Distributions of the VFs from the VFDB inside vs. outside of PAIs.

	In PAIs	Outside of PAIs	SUM
Pathogen-specific VFs	361	259	620
Common VFs	474	894	1368
SUM	835	1153	1988

Pearson Chi-square test with Yates continuity correction. χ-squared = 96.3863, df = 1, P < 2.2e−16.