During the pre-pH1N1 and the pH1N1 period overall, both models' estimates were highly correlated with ILINet data (Table 2). However, during pH1N1 Wave 1, the original model did not correlate highly with ILINet data (0.290), whereas the updated model showed high correlation with ILINet data (r = 0.945). Both the original and updated model estimates were highly correlated with ILINet data during pH1N1 Wave 2 (r = 0.916 and r = 0.985 respectively).