March April May 1 a,b,c 0,0,0 0,20,20 0,0,10 2 a,b,c 0,0,0 0,40,>70 0,20,20 3 a,b,c 0,0,0 20,40,70 0,0,10 4 a,b,c 0,0,40 10,10,20 0,10,20 5 a,b,c 0,0,0 0,0,0 0,0,0

Table 1: Numbers of CFU ml-1 on TCBS agar in samples (a, b, c) at sampling points 1 to 5 on 10 March, 14 April and 11 May 2009.

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