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Mycoplasma hyopneumoniae“Infection Chain”
Eduardo Fano DVM MS PhDBIVISwine Technical Manager Americas
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What is the current Mhyo infection picture?
• Clinically Mhyo associated respiratory disease in growing- finishing units
• In some cases there is a perception of lack of efficacy of vaccination protocols
• Are we over focusing the strategy just in the piglet?
• Are we looking at the “ whole herd’ infection picture of the disease? Are we understanding the “root’ of the problem?
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0 20 40 60
0
5
10
15
Ave
rage
Lung L
esio
n S
core
Prevalence at weaning (N-PCR, Nasal)
R-squared= 0.5304, P-Value= 0.0009
C1
C2
* Fano et al., 2007
Correlation of prevalence at weaning with severity of the disease in vaccinated finishing pigs
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Mycoplasma hyopneumoniae “Infection Chain”
Level 1
Replacement animals
Level 2
Sow herd
Level 3
Wean to finish pigs
Horizontal transmission
Vertical transmission
Horizontal transmission
Lateral
spread
External-Gilts+Gilts
Local Replacement
Fano et al., 2007
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Level 1
Replacement animals
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Persistence of infection/shedding“The key factor”
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Level 2
Sow herd
•Incoming gilts exposure/protection status
•Incoming gilts shedding status
•Sow herd instability
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Sow herd instability
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Consequence of sow herd instability:More sow to piglet transmission (prevalence at weaning) and
variability between groups
0
10
20
30
40
50
60
1 2 3 4 5 6 7 8 9 10 11 Average
Groups
Pre
vale
nce
(%)
Fano et al., 2007
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Level 2
Sow herd
Level 3
Wean to finish pigs
Vertical transmission
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0 20 40 60
0
5
10
15
Ave
rage
Lung L
esio
n S
core
Prevalence at weaning (N-PCR, Nasal)
R-squared= 0.5304, P-Value= 0.0009
C1
C2
* Fano et al., 2007
The consequence of higher vertical transmission:Higher the prevalence at weaning higher the clinical
impact of Mhyo in finishing pigs
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Vertical Transmission/Horizontal Transmission
Only one event: Infection Chain
Piglet Day Piglet Day 00
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Level 3
Wean to finish pigs
•Prevalence at weaning
•Horizontal transmission rate downstream
•Pig flow and W to F management
•Piglet immunization
•Piglet medication
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The infection chain