[The OF characteristics of streptococci group A and immunity to streptococcal infection based on the results of OF and anti-OF tests]. / OF-kharakteristika streptokokkov gruppy A i immunitet k streptokokkovoi infektsii po rezul'tatam OF- i anti-OF-testov.

The influence of the OF activity of group A streptococci on their specific pathogenic properties has been shown, which is manifested by increased virulence of these streptococci for children of younger age groups and by a two times higher isolation rate of OF+ strains in tonsillitis than in scarlet fever. The possibility of the indirect evaluation of the content of anti-M-antibodies by the results of the anti-OF test has been revealed, which permits using this test instead of the bactericidal test, more complicated, in the study of immunity to infection induced by group A OF+ streptococci. Among the main methods of laboratory support of epidemiological surveillance on streptococcal infection, the introduction of the highly discriminating OF typing and the anti-OF test into practical use is recommended.

[Materials on the serologic study of children inoculated with live measles vaccine]. / Materialy serologicheskogo obsledovaniia detei, privitykh zhivoi korevoi vaktsinoi

The results of serological examination of children, residents of Leningrad, vaccinated with live measles vaccine, are presented. A total of 2012 children were examined. Antibodies were absent in children of different age in 4.2--15.8% of cases. The greatest percentage of secronegative children (15) was noted among those vaccinated at the age of under one year. The mean geometrical antibody titres were the greatest in children aged from 7 to 14 years. The values of these mean titres were less in children vaccinated at the age of under one year than in those vaccinated later--6.5--8.6 and 10.6--11.3, respectively.