[Killer-yeast strains with a broad spectrum of action: a search among collection strains and preliminary...

Killer strains were looked for among certain yeast species belonging to five spore-forming genera (Hansenula, Pichia, Kluyveromyces, Williopsis and Zygowilliopsis) and one imperfect genus (Candida). 171 killers were found among 272 strains, and many of them had a high activity and a broad action spectrum. These as well as S. cerevisiae K1 and K2 killers (173 killers all in ail) were classified according to differences in their activity and the spectra of action on susceptible strains. Thirty-four groups belonging to 13 classes were isolated.