Table 1.

Number of samples exceeding US standards for aflatoxin M1 (AFM1) at various levels of informal milk marketing chains in Pakistan.

Level in Milk Marketing Chains	Negative Samples	Positive Samples	Percentage of Samples Exceeding US Standards (0.5 Parts per Billion, ppb)
Farmers	14	200	78.50
Small collectors	3	95	89.80
Large collectors	0	35	100
Retailers	0	138	95.65
Total	17	468	87.22