ECOLOGICAL STUDIES ON THE BACTERIAL FLORA IN THE UPPER RESPIRATORY TRACTS

(3) STUDIES ON MICROCOCCUS PYOGENES VAR. AUREUS BY BACTERIOPHAGE-TYPING

Abstract

This time, we studied on penicillin resistance, and bacteriophage-typing of 554 strains of micrococci pyogenes isolated from the noses and the throats of the healthy students of various schools and from those of various diseased, the infected lesions of various diseases, and furthermore from the organs of autopsy-cases, and also we studied on the same examination for micrococci pyogenes isolated from the noses and throats of 425 students of a certain primary school at the outbreak of scarlet fever.
The results were as follows:
(1) It was recognized that micrococci pyogenes isolated from the noses of adults belonged mainly to the third group, but micrococci pyogenes isolated from the noses of children, to the second group.
(2) Non-typable strains among the penicillin sensitive strains were mainly isolated from the noses and throats.
(3) The third group 7/+ and 42E/+ were mainly isolated from suppurative lesions among penicillin resistant strains.
(4) Both penicillin sensitive or resistant strains isolated from Impetigo contagiosa staphylogenes belonged mainly to the second group, 71.
(5) Micrococci pyogenes indigenous to the nasal mucous membranes seemed to be quite different from the strains isolated from suppurative lesions, but the nasal mucous membranes of children seemed to have close relation to Impetigo contagiosa staphylogenes.