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Biomedical subjects

V D Beliakov

Publications and source records attributed to V D Beliakov.

At least 19 recordsLinked to original sources
PubMed1993

[Angina morbidity in an organized collective with a periodic turnover of its personnel].

The article studies the average angina morbidity in the military unit during 9 years which resulted in 48.4% (scarlet fever--0.34%). Laboratory diagnostics is needed to make the estimation of streptococcal infection which has an acute respiratory infectious character during its clinical course. Among the whole number of patients 89.2% have come through this illness for one time, 9% twice, and 4.8%--three times. The dynamics of the angina morbidity had a periodical cycle of 2-3 years which was independent from the morbidity cycle of local civilian population. The authors show a statistic dependency between average morbidity index and the quantity of servicemen in one dormitory, its square and volume per one man. Application of "time before illness" index for 24 months made it possible to disclose the phase character in the development of streptococcal infection among personnel of the same call-up period. The general tendency towards reduction of the morbidity index was accompanied with regular upgrades of the infection after each spring or autumn renovation of personnel.

Adolescent↗
PubMed1991

[The epidemiological differential diagnostic signs of viral hepatitis A and viral hepatitis E].

A retrospective epidemiologic analysis of cases diagnosed as hepatitis A (HA) has been made in territories characterized by high intensity (4 towns in Central Asia) and low intensity (Novomoskovsk, Tula Province) of the epidemic process development. Morbidity structures for different age and social groups of the population, as well as the morbidity time course, both annual and over many years, were analyzed over 1973-1986. Specific features in the development of the epidemic process in HA and hepatitis E (HE), formerly called hepatitis non-A, non-B with the fecal/oral mechanism of the infection transmission, were studied. Twelve epidemiological differential diagnostic signs of these two infections were formulated, classified, and validated. Contribution of centralized water supply and sewage systems to the development of HE epidemic process and the regulating role of infectious immunological mechanisms in the development of HA epidemic process were demonstrated.

Age Factors↗
PubMed1991

[The structure of the population morbidity with specific intestinal infections in areas with different intensities in the development of the epidemic process and an evaluation of its manifestations].

The authors analyze the morbidity structure in five enteric infections (typhoid fever, dysentery caused by Shigella flexneri and Shigella sonnei, hepatitis A, and hepatitis E (non A, non B) with the fecal/oral mechanism of the agent transmission) in three towns of Turkmenia and in the town of Novomoskovsk, Tula Province. The incidence of S. sonnei dysentery was found higher in Novomoskovsk and that of the rest enteric infections under study in Turkmenia. The incidence of typhoid fever and hepatitis E was the highest among schoolchildren and adults, whereas preschool children suffered mostly from hepatitis A and S. sonnei dysentery. The authors discuss the specific features of the epidemic process manifestation in enteric infections.

Age Factors↗
PubMed1991

[A mathematical model of the epidemic process in anthroponotic infection with stable and homogeneous factors].

A very simple mathematical model of the epidemic process of human infection in the presence of stable and homogeneous factors has been created and analyzed. The theoretical possibility of describing the detailed course of the epidemic process by means of this model, permitting the consideration of inner parameters which cannot be determined in any other way, has been shown. The study has revealed that the approximation of the model to the real epidemic process is connected with the introduction of the notion of the heterogeneity of the parasite and host populations into the axiomatics of modeling.

Communicable Diseases↗
PubMed1990

[The results of a serological study of viral hepatitis patients and healthy subjects under the conditions of a high-intensity epidemic process in hepatitis A].

The activity of the involvement of preschool children of different ages in organized groups into the epidemic process of hepatitis A and the state of population immunity in elderly persons have been studied. Under the conditions of the intensive development of the epidemic process the active involvement of preschool children into this process as early as at the age of 1-2 years has been noted. At periods between epidemics the active circulation of the infective agent in the presence of decreased manifestations of the disease has been revealed.

Adolescent↗
PubMed1990

[The epidemic process of an acute streptococcal respiratory infection in large organized collectives of children].

The study of the specific features of the development of the epidemic process of scarlet fever, tonsillitis, and acute respiratory diseases (ARD) in two large organized groups of children revealed the presence of some differences which depended on the character of prophylactic measures taken in these groups. Thus, in the absence of prophylaxis with bicillin a pronounced increase in the level of carriership, accompanied by an increase in the infective capacity of carriers, was noted. This resulted in a high level and unfavorable dynamics of morbidity in scarlet fever, tonsillitis, and ARD. On the contrary, the use of prophylaxis with bicillin ensured the stability of the level of carriership, while the infective capacity of carriers was not pronounced. At the same time a rise in ARD morbidity was insignificant, and morbidity in scarlet fever and tonsillitis was reduced to nil.

Acute Disease↗
PubMed1990

[Retrospective epidemiologic diagnosis of viral non-A, non-B hepatitis with a fecal-oral mechanism of transmission of the causative agent].

The possibility of the retrospective epidemiological diagnosis of viral hepatitis non A, non B with the fecal-oral mechanism of the transfer of infection in three cities of Central Asia on the basis of the analysis of the dynamics of registered hepatitis A morbidity is shown. With the irregularity of morbidity levels among the total population being characteristic of all three cities, in Andizhan one rise in morbidity within a period of 3 years (1975-1978) and in Tashauz one rise within a period of 5 years (1975-1980) were registered. The analysis of the dynamics of morbidity observed in individual age and social groups showed that these rises, especially those registered in 1976 in Andizhan and in 1977 in Tashauz, were determined by morbidity levels among school children and adults. This is also true for a rise in morbidity rate registered in Tashauz in 1985. In Andizhan the highest morbidity rates among adults were registered in districts insufficiently equipped with modern amenities. Cases of infection registered as hepatitis A (HA) among persons immune to HA at territories with high intensity of the epidemic process of HA at the above-mentioned periods seem to be due to viral hepatitis non A, non B with the fecal-oral mechanism of the transmission of the infective agent.

Age Factors↗
PubMed1990

[An explosive outbreak of respiratory streptococcal infection with a droplet transmission mechanism].

The data obtained in the study of an explosive outbreak of acute respiratory diseases, tonsillitis and scarlet fever in one of schools in Moscow have made it possible to exclude the alimentary mechanism of its development and to demonstrate the role of the droplet mechanism of transmission in the appearance of its outbreak. The epidemiological analysis of the outbreak has permitted the formulation of the hypothesis on the conditions of the formation and spread of the epidemic variant of the infective agent; this hypothesis corresponds to the available data in literature on the qualitative changes of the infective agent in the course of the epidemic process. The study has shown that the prophylaxis of the explosive outbreaks of respiratory streptococcal infections must be ensured by the system of epidemiological surveillance with timely intervention into the epidemiological process at its early stages.

Adolescent↗
PubMed1990

[The life strategy and self-regulation mechanisms of populations of the causative agents of sapronoses (exemplified by Pseudomonas pseudomallei)].

The strategy of the selection (life) of P. pseudomallei has been defined as C-competitiveness, combining the advantages of the limited (r and K) types of the ecological strategies of microorganisms and ensuring their good capacity of survival in soil biota. The self-regulation mechanisms of P. pseudomallei populations in the environment are determined by the type of their strategy of selection, which also determines the place of this species among other organisms inhabiting the soil. C-competitiveness of P. pseudomallei permits the realization of the self-support of its populations under changing conditions of their habitat, in particular in vivo.

Animals↗
PubMed1989

[Epidemiologic aspects of the laboratory diagnosis of streptococcal infections].

Current status and prospects of laboratory diagnosis of streptococcal infections are analyzed. Available investigation schedules and methods for the detection and identification of Streptococcus pyogenes are assessed in epidemiologic terms. The importance of early laboratory diagnosis of first instances of disease is emphasized. Laboratory tests for streptococcal infection are an important element of prompt epidemiologic evaluation. They are to provide a preventive action rather than state fully-developed epidemics of scarlet fever or angina, as practiced currently. Approaches to the determination of the group and type of the causative agents are assessed critically. Additional investigation methods are presented and described.

Humans↗
PubMed1989

[Phase changes in the population of group A streptococci and their influence on the course of the epidemic process of tonsillitis].

This work presents the data on the complex evaluation of the population of group A streptococci, studied at each of four phases (reservation, epidemic transformation, epidemic spread, reservational transformation) of the course of the epidemic process of streptococcal infection of the respiratory tracts (tonsillitis) in an organized group of adults. The characterization of the phases of the infective agent in accordance with the level of the carrier state, the size of streptococcal foci and the virulence of streptococci is given. Thus, the study shows that the heterogeneity of group A streptococci with respect to their virulence reaches its maximum level at the phases of reservation and epidemic spread and its minimum level at the phases of epidemic and reservational transformation. The size of streptococcal foci in carriers and the virulence of streptococci isolated from them are the inter-related unidirectional signs of the population of the infective agent and, at the same time, the main factors responsible for the phase character of the epidemic process and the morbidity level in tonsillitis.

Adult↗
PubMed1989

[Clinical and laboratory diagnosis of streptococcal infection].

The problems related to the clinical and laboratory diagnosis of streptococcal infection at all levels of health service are analysed. The principles of microbiological streptococcal identification with the aid of express-systems and standard culture techniques are outlined. Particular emphasis is placed upon immunoassay of streptococci using a broad spectrum of extracellular products and antigens of the cell wall of group A streptococcus, and upon methodological approaches to solving certain clinical and diagnostic problems.

Antibodies, Bacterial↗