Microbial Ecology of Porcine Respiratory Health

The porcine respiratory tract harbours a complex community of bacteria, viruses and fungi that interact with each other and with the host to shape disease resistance and performance. Nasal passages, tonsils and the oropharynx provide distinct ecological niches in which microbial colonisation follows a temporal succession from birth through weaning. Early life events such as maternal microbiota transfer, antibiotic use and environmental exposure can alter community structure, diversity and functional capacity. Commensal taxa contribute to mucosal immunity, outcompete pathogens and influence inflammatory responses, while opportunistic bacteria may exploit dysbiosis to cause pneumonia or systemic infection. Understanding these microbial networks is central to reducing antimicrobial use, improving biosecurity and devising targeted probiotic or management strategies that enhance respiratory health and productivity on a global scale.

Research from Nature Portfolio

Investigation into perinatal antimicrobial metaphylaxis revealed that removal of routine early‐life antibiotic treatment leads to a notable increase in nasal bacterial diversity by weaning. Piglets raised without perinatal antimicrobials showed higher relative abundances of beneficial genera such as Prevotella and Lactobacillus and lower levels of Moraxella and Bergeyella. These shifts were accompanied by fewer respiratory clinical signs and improved growth performance, demonstrating that minimising early antibiotic exposure can foster a more resilient respiratory microbiome and support animal health.

Microbial Ecology of Porcine Respiratory Health publication trend

The graph below shows the total number of articles in microbial ecology of porcine respiratory health across all publications each year (not limited to Nature Index journals).

Technical terms

Microbiome: The collective genome and community of microorganisms inhabiting a defined environment.

Alpha diversity: A measure of species richness and evenness within a single microbial community.

Metaphylaxis: Administration of antimicrobials to a group of animals to prevent disease.

Co‐abundance groups: Sets of microbial taxa whose abundances correlate across samples, indicating ecological interaction.

Opportunistic pathogen: A microbe that can cause disease when host defences or microbial balance are compromised.

References

1. The developing pig respiratory microbiome harbors strains antagonistic to common respiratory pathogens. mSystems (2024).
2. Ceftiofur treatment of sows results in long-term alterations in the nasal microbiota of the offspring that can be ameliorated by inoculation of nasal colonizers. Animal Microbiome (2023).
3. Antimicrobial removal on piglets promotes health and higher bacterial diversity in the nasal microbiota. Scientific Reports (2019).
4. Comparison of Oropharyngeal Microbiota in Healthy Piglets and Piglets With Respiratory Disease. Frontiers in Microbiology (2018).