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For investigation of urine microflora in mice we offered to use paper disks. This new method was tested in finding of infection on the mice (CBAxC57BI) F1 after total body v-irradiation at 6,5 Gr (LD80/30). The paper disks were impregnated with one drop of urine, placed on surface Endo media, incubate in thermostat (37°C) in during 1-2 days and numbers of positive crops (Esch. coli, Proteus, Enterococcus, were indicated. It was shown that after irradiation the numbers of positive probes increased. The test displayed that the method is easy, economic and demonstrative.

In spite of intensive antimicrobial prophylaxis and therapy, most patients with acute radiation sickness I-IV severity grade (dose of 0.1-13.7 Gy) developed infections caused by bacteria, fungi and viruses. Frequency and intensity of those infections were proportional to the radiation dose and severity grade of radiation sickness.

In experiments with two species of animals (dogs, guinea pigs) irradiated with sublethal and lethal doses of gamma-rays, it was observed, that leucynferon had antiradiation effect. Course of injections: dogs--8 injections subcutaneus: 2.0 ml (1, 3, 5, 8, 12, 14, 21, 34 days after irradiation); guinea pigs--14 injections subcutaneus, 0.2 ml (1-14 days after irradiation). Therapeutical effect was explained by capacity of the preparation to defend the hemopoietic organs from the radiation and to stimulate hemopoiesis. Leucynferon hindered the development of acute radiation sickness symptoms. Immunoreactivity of dogs and guinea pigs in experimental group was more complete and restored faster. The growth of the automicroflora on the skin was restrained. Production of interferon-gamma (which is a function of T-lymphocytes) was restored faster.

In experiments with three species of animals (mice, rabbits, monkeys) irradiated with sublethal and lethal doses of gamma-irradiation, it was observed, that leukinferon used in 4 hours or 10 days after provided antiradiation therapeutical effect. When lethal dose was used (mice) the survival of animals was significantly increased. The preparation decreased depression of the functional activity of leukocytes as it was observed with IFH-alpha and gamma-production. Pestoring this function was accelerated. Phenomena pancytopenia and thrombocytopenia induced by radiation were decreased. Therapeutical effect was explained with capacity of the preparation to defence the hemopoietic organs from the radiation and to stimulate hematopoiesis. So, spleen weights and quantity of cells into bone marrow were higher in experimental group in comparison with control at any observation. CFUs were also higher (with optimal dose of preparation). Stimulation of the restoring processes was confirmed also by more intensive increasing of the reticulocyte quantities in the circulation of experimental monkeys within 20 days. Then their level became more close in both groups. The preparation stimulated also differentiation of immune effectors: immature neutrophils were absent in the circulation of experimental monkeys. Production of IFN-gamma (which is function of T-lymphocytes) was restored more fast. As a result, immunoreactivity of monkeys in experimental group was more complete and restored faster: the growth of the automicroflora on the skin surface became to increase 7 days later and was restrained. Leukinferon hindered the development of acute radiation sickness symptoms.

The experiments with AKR mice, that are carriers of the T-cell leukemia virus showed their higher radiosensitivity as compared to (CBA x C57Bl)F1 mice in respect of survival and hemopoietic status. The regular patterns observed are presumed to result from lower ability of AKR mice to repair radiation damage and provide resistance to infections.

Different methods of prophylactic treatment with influenza virus vaccine increase survival of irradiated mice and hamsters by 25-55% as compared to unprotected ones. Higher radioresistance occurs in the same time intervals as a rise of interferon in the blood after immunization with influenza virus vaccine.

A model for secondary postradiation immunodeficiency of mice has been used to compare immunocorrective activities of some new immunomodulators (arbidol, cagocel, myelopid, proleukinferon and fragmine) administered at late times (2-3 months) after exposure to a nonlethal radiation dose (4.0 Gy). The highest immunocorrective effect has been shown with fragmine and proleukinferon.

It was shown in experiments with mice and dogs that bacterial preparations (vaccinum proteus, prodigiosanum, bificolum and bificolum-f) administered before or after gamma-irradiation have a stimulating effect on hemopoiesis. It is supposed that bacterial polysaccharides play an important role in this action.

Basing on assessment of skin microflora in 3186 apparently health able-bodied individuals and on subsequent study of acute morbidity, the authors revealed direct dependence between these parameters: only 3.4% of people with normal level of microflora became ill during 1 month after the examination, the value of those with higher level was 15.5%. Therefore the skin microflora test could serve for prognosis.

In experiments with 933 (CBA x C57Bl)F1 mice it has been found that with any variant of alternation and sequence of single ionizing and SHF irradiation with lethal doses, the radiation affection caused by gamma quanta is aggravated. Preirradiation with gamma or SHF radiation ameliorates the severity of the affection caused by the subsequent SHF radiation. Parenteral injection of colloidal sulfur 60 min before SHF radiation causes a 2-5-fold increase in the survival rate of exposed and protected mice as compared to unprotected animals.

Humoral and cellular factors of the immune system of 133 subjects injured in the Chernobyl accident were studied during first 1.5-2 months after radiation, 5-17 months and 3 years after they suffered acute radiation sickness (I-IV degree). Significant disorders in the immune system correlating with the severity of the disease were recorded. In late terms certain shifts persisted in the immune status of subjects who had suffered acute radiation sickness, II and III degree.

As many as 138 patients with acute radiation sickness, grades O-IV, were examined over time. It has been revealed that disorders in microecology and humoral immunity agreed well with the severity of radiation damage.

: In experiments with CBA and CBA X C57Bl(F-1) mice it was shown that the radio-protective efficacy and the anti-infectious influence of homo- and heterologous immunoglobulin (IG) applied one, two and three times in the period from 4h to 9 days following irradiation with doses of LD80-95/30. This was displayed by the increased survival rate and normalization of intestinal microflora in treated animals in comparison with untreated ones. Heterologous IG administered at varying times (5 to 20 days) after irradiation with the dose of 4.8 Gy increased the resistance of treated mice to infection with living E. coli culture.