Lancefield group R streptococci associated with pneumonia in swine

Area of Science:

• Veterinary Microbiology
• Swine Pathology

Background:

• Streptococcal infections are a concern in swine herds.
• Understanding bacterial pathogens in porcine respiratory disease is crucial.

Purpose of the Study:

• To identify and characterize streptococcal isolates from swine during a 12-month period.
• To determine the association of specific streptococcal groups with respiratory disease in pigs.

Main Methods:

• A 12-month survey of streptococcal infections in swine.
• Isolation and identification of bacterial pathogens from affected pigs.
• Analysis of concurrent infections, including Pasteurella species.

Main Results:

• 14 out of 98 isolates (14.3%) belonged to Lancefield group R.
• Most Lancefield group R isolates were recovered from pigs diagnosed with pneumonia.
• Nearly half of the group R isolates were found in conjunction with Pasteurella pneumonia.

Conclusions:

• Lancefield group R streptococci are present in swine populations.
• This group R streptococcus appears to be associated with porcine pneumonia.
• Concurrent infection with Pasteurella species is common in pigs affected by Lancefield group R streptococci.