[Micromethod for the HA and HI tests in ornithosis]

The possibility of using the HA and HI tests in micromethod modifications in ornithosis was studied. The hemagglutinating activity of various antigens was tested. By the employment of the micromethod antihemagglutinins were found in sera from patients, immunized animals (donkey and guinea pigs) as well as from pigeons and ducks. No antibody was found in control sera and sera from tortoises. The results of the HA and HI tests performed by macro- and micromethod were similar. The micromethod is as sensitive as the macromethod but the former is more economic and permits a larger amount of work to be done simultaneously.