Map of Chiang Mai with sampling locations: site no. 1, the fifth story of the multidisciplinary building at the Faculty of Medicine, CMU; site no. 2, the residential home at Sirimungkalajarn road; site no. 3, the downtown Wararose market area; site no. 4, the third story roof of the Highland Agricultural Development building; site no. 5, the Puok-Chang Temple.