Table 1.

Number of different bacteria species isolated in samples from PPDS-affected and non-affected sows

	Pooled samples from anterior mammary glands (first 3 pairs of cranial glands)						Pooled samples from posterior mammary glands (3 – 4 pairs of caudal glands)
Number of isolated different bacteria species	0	1	2	3	4	5	0	1	2	3	4	5
In samples from PPDS+ sows (n = 27) (%)	18.5	29.7	25.9	25.9	0.0	0.0	25.9	25.9	25.9	18.5	0.0	3.8
In samples from PPDS- sows (n = 29) (%)	13.8	37.9	31.0	10.3	3.5	3.5	34.5	34.5	31.0	0.0	0.0	0.0