[Biological properties of Streptococcus bovis bacteriophages isolated from lysogenic cultures and sheep rumen].

Biological characteristics of eleven phages for Streptococcus bovis were investigated; seven phage were isolated from ovine rumen and four were virulent mutants of temperate phages of lysogenic cultures. The phages had many properties in common: similar morphology of negative colonies, the identical spectrum of lytic action, related antigens, absolute or high requirement of calcium ions, thermolability, and inactivation by the content of the rumen. Their susceptibility to the inactivating action of acetic acid, urea and temperature was however different. Chloroform and phenol may be used during purification and conservation of the phages.