Dal'nejshie nabljudenija nad izmencivost'ju avirulentnoj palocki pozhi svinej. Vlijanie pasazha cerez sredy na virulentnost' shtamma
EN
Further observations on the variability of the unvirulent Frysipelothrix rhusiopathiae. Staub's strain. Influence of passages on media on the degree of virulence of the strain