Respiratory Damage

Respiratory function diminished

Mycoplasma hyopneumoniae (M. hyo) is the primary initiator of Enzootic Pneumonia – a widespread and chronic disease in swine herds. Because M. hyo damages the cilia in the lower respiratory tract, secondary viral and bacterial pathogens can more easily invade and infect the pig. For example, it increases the likelihood of disease caused by viral infections, such as PCV2.

Clinical manifestations of Enzootic Pneumonia include:

  • Coughing
  • Reduced daily weight gain
  • Increased feed conversion ratio
  • Uneven batches of pigs
Effects of Enzootic Pneumonia
Normal Respiratory Function

The impact of lung lesions:

  • Lesions prevent normal elimination of bacteria and secretions produced from the respiratory tract
  • Non-specific immune defenses are compromised
  • Opportunist bacteria benefit from this weakened immunity causing secondary infections

Lung lesion scoring at slaughter

There are many different systems for scoring M. hyo lung lesions at slaughter. Enzootic Pneumonia Lung Scoring according to Madec scores each lobe between 0 and 4, thus:

  • 0: no lesions
  • 1: small lesions (i.e., less than a €2 coin in size)
  • 2: Lesions affecting <50% of the lobe
  • 3: Lesions affecting 75% of the lobe
  • 4: Lesions affecting the entire lobe

This method scores lesions mainly in the apical lobes and in descending order in the cardiac, diaphragmatic and accessory lobes. The maximum score is 28.

Scoring grid precised by Madec and Leneveu, 2011

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