Distribution of B. pseudomallei in Central, East, and Northeast Thailand. (a) Map of Thailand. (b) Location of the 61 rice fields evaluated. Red and white circles, culture positive and culture negative for B. pseudomallei, respectively. Province codes represent Phetchabun (C1), Phitsanulok (C2), Pathum Thani (C3), Saraburi (C4), Lopburi (C5), Nakhon Nayok (C6) and Bangkok (C7) in Central Thailand, Chachoengsao (E1), Prachinburi (E2), Sa Kaeo (E3), Chanthaburi (E4), Chonburi (E5) and Rayong (E6) in the East, and Burirum (NE1), Chaiyaphum (NE2), Khon Kaen (NE3), Udon Thani (NE4), Nong Bua Lam Phu (NE5), Loei (NE6), and Nakhon Ratchasima (NE7) in the Northeast. Maps drawn using ArcGIS 10.2 (ESRI, Redlands, CA, USA).