Etiology of mastitis

Mastitis etiology

Depending on its cause, mastitis can be either contagious or environmental, although the division between both is not entirely black and white. There are plenty of agents that can cause mastitis, but the main aetiological groups account for more than 95 % of the cases.

Main reservoirs and routes of transmission of different aetiological groups
Aetiological groups Reservoir Area of attention for control
Staphylococcus aureus Infected udder or skin

Milking machine

Streptococcus agalactiae Infected udder Milking machine
Arcanobacterium pyogenes Infected udder, bedding materials Flies
Streptococcus uberis Bedding materials

Udder preparation and resting area

Pseudomonas Water Resting area
Prototheca Water and intramammary treatments Hygiene when applying intramammary tubes
Serratia Bedding materials Resting area and teat dip products
Yeasts Environment Hygiene when applying intramammary tubes
Bacillus cereus Infected udder Resting area
Mycoplasma spp. Infected udder Milking machine
Corynebacterium bovis Infected udder Disinfection of the teats

 

Prevalence of different causative agents of mastitis
Source Verbeke et al.  (Belgium, 2014) Botrel et al.(France, 2010) Vasquez et al.(US, 2016)
Staphylococcus aureus 9 % 17 % 8 %
CNS 6% 10 % 1,9 %
Streptococcus agalactiae 0% 2 % 3.5 %
Streptococcus uberis 21 % 24% 8 %
Streptococcus dysgalactiae 8 % 10% 14 %
Other streptococci 2 % 2% 15.9 %
Coliform bacteria 18% 27% 21 %
No growth 23% 5% 36%
Yeast 2%   2
Other 9% 10% 19 %

 

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