Table 1.

Average survival time following inoculation with WNV

WNV Strains	Vero derived	C6/36 derived
	AST ± SD	AST ± SD
NY99	9.14 ± 2.47	8 ± 1.06*
PR423	8.66 ± 0.81**	6.14 ± 1.34*
PR20wh	9.33 ± 4.04	7.6 ± 0.54

This table shows the average survival time (AST) ± standard deviation of Balb/c mice after inoculation with the WNV NY99, PR423 and PR20wh. The student t-test analysis showed a significantly lower AST in the C6/36-derived PR423 group when compared to C6/36-derived NY99 (p = 0.013*) and Vero-derived PR423 strains (p < 0.001**)

AST average survival time, SD standard deviation, PR423 and PR20wh, Puerto Rico WNV isolatesWNV = West Nile virus

Student t test: PR423 (C6/36) VS:PR423 (Vero)** = p < 0.001, Student t test: PR423 (C6/36) VS:NY99 (C6/36)* = p = 0.013