Bronchially instilled IgY-antibodies did not decrease pulmonary p. aeruginosa concentration in experimental porcine...

Area of Science:

• Veterinary Medicine
• Infectious Diseases
• Immunology

Background:

• Pseudomonas aeruginosa infections are challenging due to antibiotic resistance.
• Polyclonal anti-P. aeruginosa IgY antibodies (Pa-IgY) show promise but lack study in large animal pneumonia models.
• Porcine models are valuable for studying respiratory diseases relevant to human and animal health.

Purpose of the Study:

• To evaluate the efficacy of Pa-IgY in reducing P. aeruginosa concentrations in bronchoalveolar lavage (BAL) fluid.
• To assess the impact of Pa-IgY on physiological parameters in a porcine model of P. aeruginosa pneumonia over 27 hours.

Main Methods:

• An experimental porcine pneumonia model was established using Norwegian landrace pigs.
• Animals were mechanically ventilated and randomly assigned to receive either P. aeruginosa alone (control) or P. aeruginosa with Pa-IgY (intervention).
• Pa-IgY was administered with a repeated dose after 12 hours; BAL cultures and physiological measurements were collected over 27 hours.

Main Results:

• No significant difference in BAL P. aeruginosa concentration was observed between the control and Pa-IgY intervention groups at any time point.
• Both groups showed an initial increase and subsequent decrease in bacterial concentration over the 27-hour study period.
• The Pa-IgY group exhibited significantly lower heart rate, cardiac index, arterial lactate, and core body temperature compared to the control group.

Conclusions:

• The tested dose and administration route of Pa-IgY did not effectively reduce P. aeruginosa concentrations in the porcine pneumonia model.
• Despite lack of direct antibacterial effect in BAL, Pa-IgY administration was associated with improved physiological stability.
• Further research is warranted to explore alternative dosing, routes, or combinations for potential therapeutic benefits of Pa-IgY in P. aeruginosa infections.