In healthy puppies and kittens born of older dams, maternal antibody generally protects against clinical disease.

In litters born of younger dams, or if the litter or their dam are immunocompromised, septicaemia and severe systemic disease, often culminating in death, may develop.

In older kittens, up to 6 months old, subclinical infection in tonsils may develop into clinical tonsillitis and cervical lymphadenopathy.

In addition, group B, C and G streptococci are frequently isolated from wounds and abscesses in adult cats and dogs and as opportunist pathogens secondary to upper respiratory and other mucosal infections.

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