Читать книгу Farm Animal Medicine and Surgery - Graham R Duncanson - Страница 214

• These are E. coli, Klebsiella pneumoniae, Streptococcus uberis, Pseudomonas aeruginosa, Bacillus cereus, Pasteurella spp., Candida spp. and Aspergillus spp.

• E. coli and K. pneumoniae are both very serious pathogens which normally infect newly calved cows. They both produce toxins which cause a peracute disease called ‘toxic mastitis’.

• Toxic mastitis is a specific disease syndrome often causing acute toxicity before mastitis is seen in the udder, and culture of the milk may often be unrewarding.

• Only 30% of affected animals are likely to survive toxic mastitis.

• Treatment of mastitis caused by environmental pathogens should involve NSAIDs and fluid therapy. Antibiotics suitable for use against Gram-negative bacteria are normally given parenterally and into the udder but many authorities consider that this is hardly worthwhile as the organisms have produced the lethal toxins and been destroyed.

• There are many ideas put forward for fluid therapy. The author favours giving large volumes of electrolytes with an Agger’s pump.

• Prevention measures include dry cow therapy, teat sealants and vaccination against E. coli.