A liquid culture of ATCC 607 infected with two mycobacterial phages and exposed to constant magnetic fields 0.8 G for 48 hours was replanted on simple agar media without oleic acidalbumin enrichment. In both phages a pronounced stimulating effect was observed demonstrated in the phage No. 308 by almost confluent lysis in magnetized culture and in the phage 33 D by uncountable lytic plaques. Magnetized phage cultures could be preferably used for preparing rich stock suspensions also from poorly growing phages needed for phage classification of mycobacteria.
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