M. hyo causes Enzootic Pneumonia
Mycoplasma hyopneumoniae (M. hyo) is the cause of Enzootic Pneumonia (EP) which is a highly prevalent and costly disease in pigs. M. hyo is easily spread from the sow, between pigs within a building, and via airborne transmission over 3km1.
Enzootic Pneumonia Can Be Costly
Enzootic Pneumonia is present in around 80% of the UK pig herd2. Clinical signs include1:
- Dry cough
- Mild fever
Enzootic Pneumonia is often thought of as the gatekeeper to respiratory health as it exacerbates other diseases such as Porcine Reproductive and Respiratory Syndrome (PRRS) and Flu, leading to severe pneumonia and pleurisy1.
Although mortality is usually low, when Enzootic Pneumonia takes hold, the economic effects can be serious1,3:
Impact on Production Parameters
- Daily weight gain can be reduced by 17.4%4
- Feed conversion rate (FCR) can be increased by 14%4
1 - Taylor, D. (2006) Pig Diseases, 8th edition
2 - Investigation of factors influencing the prevalence of Enzootic Pneumonia like lesions in the BPEX Pig Health Scheme. http://www.bpex.org.uk/R-and-D/funding/RD2012_PE4.aspx, accessed Feb 2014
3 - Baekbo et al. (2002). IPVS, Ames, Paper 103.
4 - Straw et al. (1985). JAVMA 195, 12, pp. 1702-1706.
pcv2: the cause of a highly contagious and common disease
On non-vaccinated farms, PCV2 prevalence is around 75%1, although vaccination is effective at reducing clinical signs and is widely carried out in the UK. The virus causes a wide range of signs which may be apparent (clinical) or invisible (subclinical):
- PCV2 is responsible for the well-recognised Post-weaning Multisystemic Wasting Syndrome
(PMWS) and Porcine Dermatitis and Nephropathy Syndrome (PDNS)
- Respiratory, reproductive and intestinal systems may be affected
- PCV2 infection has also been linked to pleurisy which can reduce carcase value at the abattoir2
- Most symptoms are subclinical, with serious economic impacts such as reduced growth rates
- Research has shown that vaccination of pigs subclinically infected with PCV2 resulted in improved daily gain, reduced mortality and increased carcase weight3
1 - Wieland et al. (2010) The Pig Journal 63: pp. 20-24.
2 - Jager et al. (2010) IPVS Congress Proceedings: p. 650
3 - Young et al. (2011) Journal of Swine Health and Production 19 (3): pp. 175-180
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