either through changes in the duration of mosquitoes and parasite life cycles or through their influences on human, vector, or parasite behaviour (Gubler et al. 2001, Wongkoon et al. 2013). Our results showed that relative humidity was strongly correlated with dengue cases in Muang Nakhon Si Thammarat, Thailand. This indicates that mosquito eggs tend to be more viable in high humidity. Local community should be warned during dengue high risk period as relative humidity increases.
This study clearly demonstrates that dengue cases were higher in the wet season than in the dry season. The possible explanation is that the number of Aedes larvae might also be higher in the wet season than in the dry season. Many studies have reported the same this in many countries such as Thailand (Thavara et al. 2001, Strickman et al. 2003), Fiji (Raju 2003) and the U.S. (Hoeck et al. 2003). Long rainy seasons, with peculiar water use patterns of the residents, create favourable conditions leading to a high number of Aedes larvae in the rainy season. People living in Nakhon Si Thammarat prefer rain- and well water to piped water for drinking and cooking purposes, and, for this reason, rain- and well water are always stored in water containers in and around the house.
Larval surveillance during this study was important to find out the extent of prevalence of vectors in a locality. House index was used in this study to help stratifying DHF risk areas for further control and monitoring of the vector population in defined areas. House index from our study indicated a high risk of DHF transmission. The WHO standard for high DHF risk areas was 5 % house index. This indicates a high risk of DHF transmission in Nakhon Si Thammarat Province, Thailand. Our results showed 59.68% house index for Ae. aegypti larvae and 62.50% house index for Ae. albopictus at Muang Nakhon Si Thammarat. Promprou et al. (2007) studied six districts in Nakhon Si Thammarat and found that all six districts had higher house index than WHO standard for high DHF risk areas. As we are GLOBE students, we should launch some campaign to raise some awareness on mosquito larvae in the area.
either through changes in the duration of mosquitoes and parasite life cycles or through their influences on human, vector, or parasite behaviour (Gubler et al. 2001, Wongkoon et al. 2013). Our results showed that relative humidity was strongly correlated with dengue cases in Muang Nakhon Si Thammarat, Thailand. This indicates that mosquito eggs tend to be more viable in high humidity. Local community should be warned during dengue high risk period as relative humidity increases. This study clearly demonstrates that dengue cases were higher in the wet season than in the dry season. The possible explanation is that the number of Aedes larvae might also be higher in the wet season than in the dry season. Many studies have reported the same this in many countries such as Thailand (Thavara et al. 2001, Strickman et al. 2003), Fiji (Raju 2003) and the U.S. (Hoeck et al. 2003). Long rainy seasons, with peculiar water use patterns of the residents, create favourable conditions leading to a high number of Aedes larvae in the rainy season. People living in Nakhon Si Thammarat prefer rain- and well water to piped water for drinking and cooking purposes, and, for this reason, rain- and well water are always stored in water containers in and around the house.Larval surveillance during this study was important to find out the extent of prevalence of vectors in a locality. House index was used in this study to help stratifying DHF risk areas for further control and monitoring of the vector population in defined areas. House index from our study indicated a high risk of DHF transmission. The WHO standard for high DHF risk areas was 5 % house index. This indicates a high risk of DHF transmission in Nakhon Si Thammarat Province, Thailand. Our results showed 59.68% house index for Ae. aegypti larvae and 62.50% house index for Ae. albopictus at Muang Nakhon Si Thammarat. Promprou et al. (2007) studied six districts in Nakhon Si Thammarat and found that all six districts had higher house index than WHO standard for high DHF risk areas. As we are GLOBE students, we should launch some campaign to raise some awareness on mosquito larvae in the area.
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