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Specific antibodies to lymphocytic choriomeningitis (LCM) virus were detected in sera of wild rodents trapped in different regions of Egypt. The highest proportion of positive sera (11.5%) was found in Sinaa Governorate of the Asian Continent, followed by Sharkia Governorate (5.6%) adjacent to Sinaa and Giza Governorate (1.8%). In Upper Egypt, however all 610 rodent sera collected in Aswan, Red sea Pernees and New Valley adjacent to Sudan were negative. The highest percentage of positive sera was in Rattus rattus frugivorus and Mus musculus species.

The possibilities of detection of the infectious agent in natural foci of plague can be expanded to some extent by using the method of search for the specific FI capsular antigen of the plague microbe in such objects of the external environment which have not yet been subjected to laboratory analysis and serological analysis in particular. Such objects include soil from the burrow and the substrate of the nest of the rodent as well as the fleas of rodents and regurgitations of birds of prey. The effectivity and suitability of examination of these objects using immuno-adsorption reactions with standard erythrocyte diagnostics (passive haemagglutination reaction, antibody neutralization reaction) were demonstrated experimentally and confirmed under field conditions in various geographical and ecological zones of the Caucasus. Thus in 1971, an earlier unknown natural focus of plague was found in the Mount Elbrus massif by means of serological analysis of the substrate of the nest and of the soil from the burrows of rodents. It can be expected that broadened serological search for the FI antigen of plague will prove useful in the study of the structure of natural foci of plague, in the reconnaissance or retrospective investigation of poorly explored territories and in the solution of some questions concerning the epizootiology of plague, such as the survival of the infectious agent in the inter-epizootic period, telluric plague, etc.