Term
|
Definition
gain entrance through the teat canal
obligate parasite of the MG
infections can last weeks to years
main reservoir is infected glands
transmission mainly during milking |
|
|
Term
| contagious mastitis pathogens |
|
Definition
streptococcus algalactea
staph aureus
mycoplasma spp
strep dysagalactae
cornebacterium bovis |
|
|
Term
| mastitis: Strep agalactiae |
|
Definition
-gram(+), obligate
-often subclinical
-high SCC
-only B toxin
-large # bacteria shed in milk
-dx:CAMP synergistic hemolysis (w/ S.aureus)
-tx: abx, eradication possible |
|
|
Term
|
Definition
-gram (+) faculative intracellular path (not an obligate parasite of the MG)
-major source of infection: infected quarters
-spread via: sloppy milking and vector (fly) transmission
-can be subclinical, acute, chronic or gangrenous
-a-toxin => necrosis, abcessation and fibrosis
-vax: will not prevent dx but will decrease clinical signs
tx: lactating cow therapy
-a and B toxin |
|
|
Term
| mastitis: arcanobacterium pyogenes |
|
Definition
-dry cow or summer mastitis
-thick pus, lots of it
-can be transmitted by flies
tx: dry cow therapy |
|
|
Term
|
Definition
|
|
Term
| mastitis: strep dysagalactiae |
|
Definition
| -contagious and environmental |
|
|
Term
| mastitis: Corynebacterium bovis |
|
Definition
-commensal of the MG
-low grade leukocytosis
-often due to lack of post dip tx or no dry cow tx |
|
|
Term
| mastitis: control dipping |
|
Definition
pre-dip to avoid environmental mastitis
post-dip to avoid contagious mastitis |
|
|
Term
| mastitis: lactating cow therapy |
|
Definition
|
|
Term
| mastitis: dry cow therapy |
|
Definition
-tx during 60 day dry period
-use just tip |
|
|
Term
| environmental mastitis: pathogens |
|
Definition
-coliforms: most common (E. coli, proteus, pseudomonas)
-arcanobacterium pyogenes
-S. dysagalactiae
-S. Uberis
S. bovis |
|
|
Term
|
Definition
moisture, humidity, heat
udder edema
saw dust- klebsiella
water- pseudomonas
most will clear spontaneously- 10% chronic
-don't want to rx with abx b/c can cause septicemia => DIC |
|
|
