摘要: IT has been the general experience of phage investigators1 that bacterial viruses reach their highest titres when preying on rapidly growing cultures, differing thereby from large group plant and animal viruses, which are able to multiply in host cells regardless stage development. Krueger et al.2 showed staphylococci will support reproduction presence penicillin inhibits own growth; but such organisms must first be ‘activated’, means they have entered logarithmic phase growth.