Accession Number:

AD0645013

Title:

THE PART PLAYED BY BIRDS IN CIRCULATION OF TICK-BORNE ENCEPHALITIS VIRUS,

Descriptive Note:

Corporate Author:

NAVAL MEDICAL RESEARCH UNIT NO 3 CAIRO (EGYPT) DEPT OF MEDICAL ZOOLOGY

Report Date:

1963-01-01

Pagination or Media Count:

20.0

Abstract:

An analysis was made for the presence of antibodies against the tick-borne encephalitis virus covering a total of 198 birds belonging to 61 different species. Of this number, 121 were subjected to the CF and ICF, 39 to N. and 38 - to all the three types of tests. Positive reactions were recorded in 87 instances of individual birds of 46 species. The total number of bird species now known to be liable to infection with the tick-borne encephalitis virus amounts to 100. The virus infection rates for representatives of diverse ecological groups of birds during the season are quite similar and vary within the range of 27 - 50 per cent, thus suggesting the existence of ways and means of bird infections with tick-borne encephalitis virus other than inoculation through ticks of Ixodes persulcatus P. Sch. In spite of high infection rate for representatives of different ecological groups of birds, their importance in the circulation of the virus is far from being of the same order. A comparison of indices for ticks feeding on birds with the proportion of individual birds contracting the infection according to different ecological groups shows that it is only the representatives of the first group birds permanently feeding on the ground that play an essential part in the infection of the wood tick larvae and nymphs. The other groups have a share of only 10 per cent of the larvae and nymphs from among the ticks infected from birds. For this reason the main attention should be directed toward the first group of birds when studying tick-borne encephalitis foci. Author

Subject Categories:

  • Biology
  • Microbiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE