\ Pathogen factors / Virulence factors Other diseases Age/Parity Breed Environmental factors

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Milking techniques
Number of organisms 
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Blind treatment
/
Milking machine
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Pathogen factors
/
Virulence factors
Other diseases 
Age/Parity 
Breed
Environmental
factors
-Dietary
/
t 
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Hygiene 
Housing
Blood group 
Teat injuries
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Dry period 
Milk SCC 
Milking interval 
Milk yield/flow rate
Stage of lactation
Udder defense 
Udder conformation