Table 1.

Summary of the bivariate analysis for the viral contamination by site.

Sampling sites	No. of samples (n)	Contamination
		Virus absent		Virus present
		Frequency	(%)	Frequency	(%)
S1	36	35	97.22	1	2.78
S2	36	35	97.22	1	2.78
S3	36	34	94.44	2	5.56
S4	36	35	97.22	1	2.78
S5	36	28	77.78	8	22.22
S6	36	31	86.11	5	13.89