The role of associated microflora in the rooting of animal viral infections and the formation of their enzootic foci

Under martial law, the epizootic situation in livestock production is characterized as stably tense, self-regulating, with a clear trend of massive rooting of dangerous viral infections. The results of monitoring studies conducted at six commercial pig farms in the Kharkiv, Sumy, and Dnipro regions revealed a pattern of gradual formation of enzootic foci of circovirus infection (PCV2) over two to three years in four of the farms and Aujeszky's disease (AD) for two to three years in two of the farms. This pattern was observed to occur by transforming these diseases from emergent to factor infections. With high statistical reliability, it was proved that pathogenic bacteria of the pig associative microflora are closely related to the processes of rooting of PCV2 and AD. It is shown that the probability of chances for such a scenario of the epizootic process for PCV2 is 5.3114 < ODpcv= 6.2030 < 7.2442 and for AD 2.6363 < ODad= 3.0928 < 3.6282. It was established that epizootic emergencies in all six pig farms in the period 2012-2021 developed according to a common scenario: from the emergence of the disease to the state of “factor infections” - mainly of the breeding core of the herd, the clinical manifestation of which depends on the quality of vaccine prophylaxis and seasonal and technological stresses