[Comparative study of 2 serological methods of diagnosis of acute respiratory Mycoplasma pneumoniae infections].

Complement fixation (CF) and haemagglutination (HAP) with M. pneumoniae antigen have proved valuable methods for the etiological diagnosis of acute respiratory infections. Both methods are sensitive and specific, provided purified antigens are used, of the Kenny and Grayston lipid antigen type for CF and the antigen treated by ultrasound and purified by centrifugation for HAP.

Q-fever soluble vaccine effects in Coxiella burneti sensitized humans.

A Q-fever soluble vaccine (phase I C. burnetitrichloro-acetic acid extract) was administered in a single dose to 28 persons formerly immunized with the same soluble vaccine one year before and to other 28 persons which had naturally been infected with C. burneti one or two years ago.

[Data on the use of serological tests for differentiation of exanthematous typhus primary infection from that of recurrences in native cases of Brill-Zinsser disease].

A group of sera from autochtonous cases of Brill-Zinsser's disease, in the early acute phase, were examined by the tests of Murray et al. and Voronova, in the course of a study on the characteristics of the immune response in primary and secondary stimulation with Rickettsia prowazeki. The results obtained both with these sera and those of primary typhus cases from other countries, suggest the possibility of establishing a serologic diagnosis of Brill-Zinsser's disease, with certainty, by identifying the secondary nature of the disease according to the presence of antibodies type 7 S.