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Group A Streptococcal L Forms I. Persistence Among Inoculated Mice

National Institute of Health and Medical Research, and Rheumatic Fever Research Laboratory, International Children's Centre, Paris, France
National Scientific Research Council, Breeding Centre for Laboratory Animals, Gif/Yvette, France

ABSTRACT

L forms induced from two strains of group A Streptococcus were inoculated intraperitoneally and intravenously into conventional and germ-free mice. After intravenous injection, streptococcal L forms disappeared very quickly from the blood, whereas, after intraperitoneal injection, it was possible to isolate them as long as 25 days after inoculation. Observations suggest that a certain degree of reversion to a bacterial form may occur spontaneously in animals.