Barrier function of palatine tonsils is quantitatively characterized by the stomatolacunar coefficient — a ratio of the destroyed microbes revealed in an oral cavity to the rest in tonsils lacunas. It made up 47–98 % that confirmed a role of faucial tonsil as an advanced post of infectious protection and organ of the central immunity. According to the ecological role lacunas microbes have been divided into 4 groups: transitory, saprophitic, minor and parasites. Clinical variants of lacunas microbiocenosis are revealed: probiosis (the compromise, unsterile immunity) and antibiosis (parasitism). As an early attribute of probiosis transition into antibiosis served decompensation of protective function of lacunar epithelium — inefficient phagocytosis of microbes.
