Table 3. Significant clusters of DEN-1 and DEN-3 from 1999 through April of 2003.

CLUSTERS OF DENV-1
Year	Trimester	Parameter (meters)	Cases	Controls	Radius (meters)	P-value
1999	MAY–AUG	100	3	0	8.7	< = .001
2000	JAN–APR	600	3	3	330	0.015
2001	SEPT–DEC	300	4	4	200	0.006
2001	SEPT–DEC	600	6	15	530	< = .001
2001	SEPT–DEC	600	5	17	580	0.015
2001	SEPT–DEC	900	6	23	750	0.008
2002	JAN–APR	600	8	23	600	0.032
2002	JAN–APR	900	10	35	610	0.01

No significant clusters of DENV-2 were identified during the study period.