Competitive exclusion of pathogen

Competitive exclusion of pathogens is not a single molecule or receptor but rather an ecological and microbiological principle. It describes the process by which beneficial microorganisms outcompete pathogenic organisms for limited resources or ecological niches within a host or environment. This can occur through several mechanisms, including direct competition for nutrients and binding sites on host tissues, production of antimicrobial compounds that inhibit pathogens, and depletion of essential ions required for pathogen growth. For example, in poultry science, introducing mature intestinal microbiota to chicks can prevent colonization by Salmonella through competitive exclusion[2]. In food preservation, certain Lactobacillus species inhibit spoilage fungi via manganese depletion[4]. While this concept is foundational in infection control and probiotic development, it does not refer to a specific molecular target such as a receptor or enzyme but rather to the collective action of microbial communities against pathogens[1][3][5].

Other names

Competitive exclusionGause's lawExclusion principle

Competition for nutrients and attachment sites[2][4] Production of antibacterial substances (e.g., volatile fatty acids, bacteriocins)[2] Depletion of essential ions (e.g., manganese scavenging by Lactobacillus)[4]