Analyzing the spatio-temporal relationship between dengue vector larval density and land-use using factor analysis and spatial ring mapping

Table 5 Number of villages with optimal, moderate, alarm and emergency Breteau index (B.I.)

District no.	Sample villages	Optimal index	Moderate index	Alarm index	Emergency index
6501	20	0	3	14	3
6502	9	0	2	7	0
6503	8	1	0	6	1
6504	12	3	3	3	3
6505	7	0	4	3	0
6506	13	1	1	10	1
6507	6	0	1	4	1
6508	11	0	0	11	0
6509	6	0	2	4	0

According to the risk levels set by National Institute of Health (NIH), Thailand optimal control is a B.I. < 5% and emergency levels of infestation are indicated by a B.I. of 50% or greater. Further as per Ministry of Public Health Thailand (MOPH), Phitsanulok two more groups were categorized, i.e. B.I. between 5% and 10% as moderate index and B.I. between 20 to 50% as alarm index.

ISSN: 1471-2458