Biomedical subjects
Publications and source records attributed to V A Nersesov.
The epidemic outbreak of Legionella infection at two industrial enterprises during the period of July-August 1988 is described. The results of the epidemiological study, the clinical course and the serological diagnosis of the outbreak are presented. For the first time in the USSR a new form of the disease has been described at the territory of Georgia. This form, named Legionella fever, is manifested mainly by skin eruptions.
A complex method for the epizootological and epidemiological surveillance of a number of bacterial and viral infections on the territories inside and outside their natural foci has been developed. The investigation techniques are described and the data on the isolation rate of each causative agent in different geographical zones are presented. In the natural foci of plague and tularemia, as well as on the territories outside such foci, the causative agents of intestinal yersiniosis, pseudotuberculosis, salmonellosis, erysipeloid, staphylococci and streptococci, arena- and arboviruses have been isolated from the rodents and ectoparasites under study. The results of this investigation suggest that the method may be recommended for use in medical institutions dealing with the problems of infections originating from natural foci.
The natural focus of tularemia was found to cover the whole territory of the Kartlian plain. Epizooty occurred mainly among common voles with the involvement of insectivorous voles. Hard ticks, gamasids and fleas infected with Francisella tularensis were detected. Rodents highly sensitive to tularemia can be affected by this infection. Water rats were not involved into the enzootic process. Further studies are necessary for the final solution of this problem.
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The authors propose the novel disinfectant Vibacide for decontamination of objects during experimental and experimental work against alive fleas. The disinfectant as 1-2% solutions had no toxic effect on Nosopsyllus consimilis fleas.
An epizootological study of the ticks gathered from the cattle and ground surface in the Dedoplistskaroisky and Dushetsky districts of Eastern Georgia has identified 5 Salmonella a typhimurium strains. The strains were isolated from the ticks Haemaphysalis punctata, Rhipicephalus bursa, Hyalomma plumbeum. They were found to be resistant to 10 of 16 antibiotics. The strains showed a high sensitivity only to 3 antibiotics, such as gentamicin, cirpofloxacin, and nitrofurantoin and 3 strains were highly sensitive to chloramphenicol. The above ticks seem to have been spontaneously infected with the pathogen Salmonella on the animals at the moment of bacteremia.
Since 1960 the cases of isolating the pseudopathogen agent have been recorded in Georgia at particular regular intervals. The accumulated material mainly involves epizootiological findings, which may provide a definite insight into the prevalence of this disease in Georgia. In 1960-1990, 31 strains were isolated in particular regions and populated areas; these included 17 strains from grey rats, 4 from house mice, 9 from common voles, and 1 from field mice. The particular constancy of isolation of the pseudotuberculosis pathogen from synanthropic rodents indicates that they may really infect humans, contrary to the opinion of G. P. Somov et al. who consider that among the synanthropic rodents there is only a chronic epizootic causing no animal death and that the role of the rodents in the spread of infection among humans is insignificant. However, doubt is cast on the validity of this proposition as the evidence for carriage alone among the rodents is lacking. The special literature contains no information on the dynamics of an epizootic process of pseudotuberculosis among the synanthropic rodents whereas the high pathogen detection rate in the viscera of these animals, recognized by Somov et al., mostly likely confirms the possibility of the course of epizootic manifested by the disease, but not only carriage. There is reason to consider pseudotuberculosis to be a naturally focal disease that is characterized by recurrent epizootics of varying intensity. Therefore, wild and synanthropic rodents may be as a reservoir and a source of infection. The circulation of the pathogen among wild and synanthropic rodents, in terms of their ability to be preserved and breed in the environmental objects, presents a permanent risk of not only sporadic cases, but also pseudotuberculosis outbreaks.