NAVLE Guinea Pigs

Guinea Pig Streptococcosis Study Guide

Streptococcosis in guinea pigs (Cavia porcellus) represents one of the most clinically significant bacterial infections encountered in this species.

Overview and Clinical Importance

Streptococcosis in guinea pigs (Cavia porcellus) represents one of the most clinically significant bacterial infections encountered in this species. The disease is primarily caused by Streptococcus equi subspecies zooepidemicus (the most common pathogen) and Streptococcus pneumoniae. These infections manifest as multisystemic disease with various clinical presentations including cervical lymphadenitis (also known as "lumps"), pneumonia, septicemia, otitis media, and reproductive disorders.

Streptococcosis is a high-yield topic for the NAVLE examination due to its zoonotic potential, characteristic clinical presentation, and unique treatment considerations in guinea pigs. Understanding antibiotic safety in this species is critical, as many commonly used antibiotics are contraindicated due to disruption of the normal gastrointestinal flora.

Route Mechanism Clinical Outcome
Oral/Oropharyngeal Mucosal abrasions from coarse feed, dental disease, or bite wounds allow bacterial entry Cervical lymphadenitis (most common)
Nasal/Conjunctival Direct inoculation through intact nasal or conjunctival mucosa Cervical lymphadenitis, respiratory infection
Respiratory Aerosol Inhalation of droplets from infected animals (sneezing, coughing) Pneumonia, systemic infection
Genital Sexual transmission or during parturition Metritis, mastitis, stillbirths, abortions
Cutaneous Wounds, bite injuries, or skin abrasions Localized abscess, septicemia

Etiology and Causative Agents

Guinea pigs are susceptible to infection by several Streptococcus species, with two being most clinically significant:

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