Fig 3. PCR positivity rates and the correlation between PCR positivity and the B. pseudomallei isolation rate.

Air particles were collected from different sites (See Fig 1). The average PCR positivity rates per month at Sites D-G (core region, black circle) and Sites A-C and H-L (surroundings, hollow circle) are shown. The significant difference (*, p<0.05) of monthly PCR positivity between the core region and surroundings is shown. The isolation rates of B. pseudomallei (hollow square) in the superficial layer of a northwestern cropped field are shown.