Immunological side effects of some long term taking medicaments.

In view of epidemiologic aspects of AIDS we studied the immunological side-effects of oral hormonal contraceptives and the barbiturates--which are used by many people in Hungary. We studied healthy persons using more than six months one of the above described drugs. We found significant decrease in the number of "O" cells and in the serum concentration of IgG in the O.

[Microbial contamination of railroad trains].

The bacterial contamination of the air was studied in moving rail road trains. The air in front of the trains is poor in microorganisms. The contamination increases to the end of the train which is caused by the dust which is whirled up by the air stream from the rail substructure and the depletions from the toilets.

[Effect of human excrement on the air flora in the vicinity of moving trains].

The use of train lavatories by the passengers during their journey was investigated. Selective samples in Petri dishes were exposed for 1 or 2 minutes at different times against the direction of train motion. The analysis showed that enterobacteria (E.

[Further microbiological studies of the air in a newly built (under the pavement) section of the underground railway in Budapest].

In three subway stations, which are "sub-pavement" stations (Budapest), microbiological air analyses were simultaneously carried out by means of sedimentation and by the use of Krotow's impactor. In the course of the examinations, which lasted eight months, the following max. values were obtained on the agar plates: 78 colonies/dm2/h and 239 colonies/m3; the rates of incidence for pathogenic and indicator bacteria were 2.