Table 1.
Overview of Streptococcus species causing bovine mastitis.
|
Streptococcus Species |
Lancefield Classification |
Transmission | Phenotype (+ Positive − Negative) |
Virulence Factors |
Antibiotic Resistance (Top 3) |
Risk Factors |
Host Specificity |
|---|---|---|---|---|---|---|---|
|
Streptococcus
agalactiae |
B | contagious | beta-hemolytic + CAMP − aesculin |
CspA Bca FbsA/FbsB Lmb |
50.5% sulfatrimethoprim 46.2% tetracycline 15.4% erythromycin |
milking | zoonotic |
| Streptococcuscanis | G | contagious | beta-hemolytic − CAMP + aesculin |
SCM SLS |
33% penicillin 0% cephalothin 0% oxacillin |
pathogen transfer from cats and dogs |
zoonotic |
|
Streptococcus
dysgalactiae ssp. dysgalactiae |
C | intermediate | non-hemolytic − CAMP − aesculin |
MAG DemA Superantigen |
38.5% tetracycline 4.8% erythromycin 4.4% streptomycin |
summer (transfer by flies) |
cattle- specific |
|
Streptococcus equinus (previpously S. bovis type II/2) |
D | environmental | variable hemolytic − CAMP + aesculin |
zoonotic | |||
|
Streptococcus lutetiensis (previous S. bovis type II/1) |
D | contagious | alpha-hemolysis − CAMP + aesculin |
Hly scpB Bca Superantigen |
63% enrofloxacin 49% ceftiofur 43% tetracycline |
zoonotic | |
|
Streptococcus
uberis (Streptococcus parauberis) |
diverse (mostly E) |
environmental | alpha-hemolytic variable CAMP + aesculin |
Sua/Vru HasC PauA/SkC |
32.9% enrofloxacin 20.0% erythromycin 19.1% lincomycin |
straw as bedding material |
cattle- specific |