Mastitis Flashcards
Bacteria in mastitis resistant to many therapies
Staph aureus (Mycoplasma?)
E.coli mastitis in a herd what is the best way to prevent it?
Vaccine J5 at dry off, prepartum, postpartum
Off label treatment for mastitis and fever
?
Cow with RF S. aureus mastitis, treated twice with pilrymycin in all teats. Now toxic LH. What to do?
?
Vaccine for E. coli mastitis
J5 Dry-off, 30d after dry-off and after calving
Pseudo-contagious agents of mastitis
S. uberis S. dysgalactiae Environmental but can act as contagious
Should mastitis due to Gram + bacteria be treated?
Yes, using intra-mammary antibiotics penicillin, erythromycin, pilrymycin
When to treat a Gram - mastitis?
In case of bacteremia: ceftiofur, oxytetracycline
Virulence factor of S. aureus in mastitis
alpha-hemolysin
Most common pathogens in subclinical mastitis
S. aureus + S. agalactiae (coagulase neg staph)
Common bacteria in clinical mastitis
coliform and environmental strep
Obligate udder pathogen that is contagious and only colonizes the duct system
Streptococcus agalactiae Easy to treat–> penicillin (compensate to treat because it will increase prod)
Most prevalent bacteria in contagious mastitis
Staphilococcus aureus Infection of parenchyma, long term Intermittent shedding
Treatment for S. aureus mastitis
Cure rates generally low Better to treat primiparas / older cows more dif
Clinical characteristics of mycoplasma mastitis
Severe altered mammary secretions (rice in dirty water) No systemic signs of disease Spread from quarter to quarter
Treatment response for mycoplasma mastitis
Little if any response to antibiotic therapy Once infected, always infected
Which bacteria in mastitis is correlated with poor equipment function?
Streptococcus dysgalactiae
Most important environmental pathogen in mastitis
S. uberis Infection during dry period
When to use intramammary antibiotic for coliform mastitis?
Sealant at dry off and atb, dry period intramammary atb less effective
Clinical presentations of coliform mastitis
-Classic: Acute severe mastitis, systemic involvement -Emerging: acute mastitis w/o systemic signs, followed by persistent infection within the gland
Contagious bacteria in mastitis
Strep. agalactiae Staph. aureus Mycoplasma Corynebacterium bovis
Horse-shoe scabs in cow teats
Psedocowpox virus Zoonosis hands milking tecs Self-limiting 3-5wk
Signs of Bovine herpes mamillitis (BHV-2 and BHV-4)
Edema, vesicles, ulcers, scabs
Signs of bovine papillomavirus
Warts young animals, self-limiting
