[The fixing complement antibodies to respiratory viruses--influenza A1, B, C, parainfluenza 1 (Sendai), syncytial respiratory, Adenovirus, Echo 11--and "Mycoplasma pneumoniae" in healthy persons (author's transl)].

Serological research of complement fixation test (Kolmer micromethod) into 163 young healthy subjects (18-22 years old) in order to point out the contaminations effects of respiratory viruses and of Mycoplasma pneumoniae. In is pointed out serological simultaneous reactions on some subjects, expression of multiple infections; the different frequency of serological tests for each antigen, pointing out the rôll played by the singles diseases, the different titre distribution of the antibodies to 1:4 to 1:128. It is pointed out the value of the antibodies patrimony in existence in healthy persons, in order to prevent the diseases caused by virus and Mycoplasma pneumoniae. It is stressed the rôll of some mammalia and birds as hosts of human influenza virus, subjects of mutation in such organismes. The new virus attack the man with the virus pertinent to the animals, in special way to equins and birds.