When porcine blood was examined in the blood processing plant, its bacterial counts were as follows: total bacteria, 2.8×104/ml; psychrotrophic bacteria, 1.5×10⁴/ml; coliform bacteria, 4.2/ml; pathogenic Staphylococci, 4.6/ml; thermoduric bacteria, 1.9/ml; on the average, Clostridium perfringens or salmonellae were not demonstrated. These counts were constant or decreased during storage at 4°C for 48 hours.
Porcine plasma, as an end product, showed the follwing counts: total bacteria, 1.9×104/ml; psychrotrophic bacteria, 1.1×10³/ml; coliform bacteria, 3.2/ml; pathogenic Staphylococci, 2.1/ml, thermoduric bacteria, 1.1/ml; on the average. C. perfringens was not detected. Salmonellae were isolated from one of 48 plasma specimens. Antibiotics or chemotherapeutics were not demonstrated. Bacterial contamination was more remarkable in summer than in any other season. In procine plasma the count decreased gradually during storage at-20°C.