This allows the resistance to spread across the same pathogen or even similar bacterial pathogens. This bacterium, an emerging pathogen, produces AHLs. This process requires immune mechanisms to kill or inactivate the inoculum of the pathogen. It is an obligate intracellular pathogen. Members of every class of pathogen that infect humans also infect plants. Pseudomonas is the most common offending pathogen. An antigen is the part of a pathogen that elicits an immune response. It is commonly found with another pathogen, "Candida albicans", forming multispecies biofilms. It is the first pathogen identified as a virus. These peptides are products of proteasomal degradation of proteins originated by the invading pathogen. They also found more genes that undergo phase variation than any pathogen then known. It was first discovered in the human pathogen "Streptococcus pyogenes". TBK1 promotes autophagy involved in pathogen clearance. "P. syringae" is a prolific plant pathogen. This wall of macrophages surrounding a pathogen is called a granuloma.