“…schoolchildren, agro-industrial workers, military men, coal miners, public bathers, sport-active individuals, diabetics etc.) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]. The vast majority of the studies which relate clinical manifestations to specific pathogenic agents are hospital-based patient series [8].…”