The author has proven that pseudorabies is a very common disease in pigs in western Central America. He studied the content of the corresponding antibodies in the sera of pigs. He examined samples of sera from pigs hyperimmunized against pig cholera.
This work is the first in a whole series of works that the authors have undertaken to study this problem. To obtain elementary bodies, white rabbits were infected into the skin with a thick suspension of dermovaccine.
In a previous work, the authors showed that vaccination and revaccination phenomena of a person depend to a large extent on the living conditions in which the vaccinated person is located, on his age and sex. Since these data were obtained on statistical material and, therefore, may meet with completely legitimate objections, the authors checked their conclusions on experimental material.
The weakening of virulence with frequent reseeding was possible to ascertain in those strains that had long been grown in the laboratory. Freshly harvested crops were found to be more resistant.
An aqueous extract of testicles, when administered intradermally, increases tissue permeability; if the animals are injected intradermally with a suspension of bacteria together with testicular extract, the nature of the body's response to infection changes dramatically. The authors studied this issue in detail in relation to tuberculosis bacilli.
Until now, the study of streptococci in the oral cavity did not concern the immunizing properties of this microorganism. The author, trying to fill the existing gap here, examined from this point of view various types of streptococci isolated from saliva, dental caries, alveolar abscesses and alveolar pyorrhea.
The author has shown that a monkey infection (Cynomolgus, Rhesus and Cercopithecus) PL Knowlesî develops severe anaemia as a result of erythrocyte destruction and blockage of blood forming organs.
The authors studied the question raised by them for one year and came to the following conclusions. 1) The malaria parasite can overwinter in the body of a mosquito and in these cases is detected when the insect is dissected. 2) The infectivity of mosquitoes in winter is higher than in summer. 3) Infected An. maculipennis contain predominantly sporozoids and can therefore infect humans during winter and spring.
The author tried to transplant all three strains from humans directly into monkeys, wolves, rats, mice and various bird species.
The presence of isohemolysin in adults was proved as early as 1905 by Landsteiner and Leiner. In newborns, a systematic study of this phenomenon has not yet been carried out, and the author, for the first time putting this issue on the agenda, showed that out of 112 examined newborns, 28 (25.6%) contained isohemolysin in the blood of the umbilical vein.
Experiments have shown that in syphilitic mice, the infection is not transmitted either sexually or through the placenta, and the young remain completely healthy even when the mother is sick with syphilis.
In view of the great practical importance that undulating Banga fever now has, it is extremely interesting to study its relationship to undulating Bruce fever (Maltese fever), as well as the existing relationship between Brucella strains found in humans, cattle and pigs.