Table 3 Cough indices and pathologic lesions associated with Mycoplasma hyopneumoniae (MHP) infection by room

Cough counted per pig over 27-min (blind observer to MHP status)^b

 First observation

DPI 21

DPI 10

DPI 14

DPI 10

-

 Coughs per 27 min (mean ± se)

5.8 ± 1.9

8.7 ± 2.1

18.5 ± 4.1

18.3 ± 6.7

-

 Coughing pigs per day (mean ± se)

1.9 ± 0.8

1.8 ± 1.0

3.8 ± 2.0

4.6 ± 2.5

0

 Number of days with coughing pigs

9

13

14

9

0

 Total number of coughs

99¹

147¹

314²

292²

0

 Maximum cough (number of coughs)

DPI 56 (26)

DPI 24 (30)

DPI 38 (50)

DPI 21 (79)

-

Coughs recorded over 24-h (SoundTalk®, SoundTalks NV, Leuven, Belgium)^c

 Coughs per 24 h (mean ± se)

23.4 ± 4.1

55.6 ± 6.6

33.1 ± 4.1

76.6 ± 11.2

23.1 ± 3.6

 Total number of coughs

959¹

2,279^2,3

1,390^1,2

3,292³

992¹

 Maximum cough (number of coughs)

DPI 34 (139)

DPI 39 (152)

DPI 30 (108)

DPI 22 (232)

DPI 54 (83)

 Respiratory distress index (mean ± se)

0.02 ± 0.01

0.17 ± 0.03

0.04 ± 0.01

0.12 ± 0.02

0.01 ± 0.01

 Maximum respiratory distress index

DPI 34 (0.20)

DPI 31 (0.58)

DPI 30 (0.22)

DPI 35 (0.53)

DPI 3 (0.41)

Lung score

 Median gross lesion (min–max)

2.9% (0.6–36)

1.1% (0–12)

1.1% (0–18)

0.4% (0–3.8)

0% (0–0)

 Median microscopic score (min–max)

4 (3–4)

3 (1–4)

4 (1–4)

3 (2–4)

1 (1–1)