Table 1.

The Pearson correlation analyses among six environments for IT (above diagonal) and DS (below diagonal) separately

Environments	CZ15	CZ16	MY16	CZ17	MY17	WJ17
CZ15	1	0.627**	0.600**	0.641**	0.597**	0.537**
CZ16	0.621**	1	0.705**	0.706**	0.627**	0.656**
MY16	0.644**	0.685**	1	0.672**	0.742**	0.700**
CZ17	0.585**	0.633**	0.693**	1	0.652**	0.730**
MY17	0.506**	0.512**	0.746**	0.658**	1	0.624**
WJ17	0.596**	0.662**	0.719**	0.709**	0.649**	1

IT infection type, DS disease severity, CZ15 Chongzhou 2015, CZ16 Chongzhou 2016, MY16 Mianyang 2016, CZ17 Chongzhou 2017, MY17 Mianyang 2017, WJ17 Wenjiang 2017

**, Significant at p < 0.01