Table 4.

Relative risk of potential disease vectors (number of female Ae. aegypti age > 14 d) in Hermosillo relative to Nogales by month

Adult Ae. aegypti > 15 d
Month of comparison	Relative risk	Relative risk (95% CI)	P-value
July	1	2.25 (0.53, 9.43)	0.27
Aug.	1	2.67 (0.62, 11.30)	0.18
Sept.	1	5.05 (1.59, 16.03)	0.006

Negative binomial regression was used to compare calculated numbers of female Ae. aegypti that were > 14 d between Nogales and Hermosillo in July, August, and September. There were no significant differences in the relative trap counts of Ae. aegypti females that were >14 d old in July or August, but counts were significantly higher in September in Hermosillo as compared to Nogales.