The role of infectious agents in the etiology of inflammatory diseases once believed to be non-infectious is increasingly being recognized. Many bacterial components in the indoor dust can evoke inflammatory lung diseases. Bacteria secrete nanometer-sized vesicles into the extracellular milieu. so-called extracellular vesicles (EV). https://www.spidertattooz.com/Estes-C6-5-ENGINE-BULK-PACK/