Time (h) relative to pasteurization

Standard Plate Count (cfu/ml) Incubation Temperature (°C)
-1§ 56,342,000 Farm NR
8489 Farm 37
1 2370 Indoor¥ 37
2 17,747 Indoor 37
3 17,140 Indoor 36
4 186,800 Indoor 36
5 1,054,900† Indoor 36
6 1,739,333 Indoor 36
7 6,498,309‡ Indoor 37
8 43,400,600≠ Indoor 37
10 113,377,000 Indoor 38
12 141,300,000¶ Indoor 38
24 200,005,443,333± Indoor 37
1 10,543 Outdoor 27
2 11,701 Outdoor 29
3 34,200 Outdoor 31
4 12,712 Outdoor 34
5 20,667 Outdoor 32
6 104,733 Outdoor 30
7 114,467 Outdoor 30
8 658,509 Outdoor 31
10 760,733 Outdoor 30
12 727,267 Outdoor 28
24 66,075,516,061€ Outdoor 23
§ -1 indicates immediately pre-pasteurization; raw milk on the farm
£0 indicates immediately post-pasteurization
NR=Not recorded
¥ Indoor incubation was at 37°C during Summer
† Median=2500 cfu/ml
‡ Median=220,000 cfu/ml
≠ Median=2,200,000 cfu/ml
¶ Median=3,400,000 cfu/ml
± Median =14,500,000 cfu/ml
€ Median =44,000,000 cfu/ml
Table 6: Standard plate counts for bacteria in pasteurized milk samples over time post-pasteurization by incubation method and hourly temperature for Summer season. Each value is the mean for 3 samples, one from each study farm.