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Interference between cold-adapted (ca) influenza A and B vaccine reassortants or between ca reassortants and wild-type strains in eggs and mice

Identifieur interne : 001E00 ( Main/Exploration ); précédent : 001D99; suivant : 001E01

Interference between cold-adapted (ca) influenza A and B vaccine reassortants or between ca reassortants and wild-type strains in eggs and mice

Auteurs : Julia R. Romanova ; Tatiana A. Ermachenko ; Galina I. Alexandrova ; Gregory A. Tannock [Australie]

Source :

RBID : ISTEX:7A70309D877CDB47D8E40C9DB4AF32CA056F81AE

English descriptors

Abstract

Abstract: Interference between pairs of cold-adapted (ca) influenza A and B vaccine reassortant viruses and between ca influenza B reassortant viruses and wild-type influenza strain A/PR/8/34 was studied in embryonated eggs and/or in the respiratory tract of three strains of mice. Interference in eggs between ca A and B reassortants occurred after 2 days but was masked by later cycles of growth. When doses of 106 EID50 of the reassortant viruses B/60/32/R and A/47/6/R were administered to outbred mice, interference with the growth of A/47/6/R occurred in the turbinates; interference with the growth of B/60/32/R did not occur. However, interference with the growth of B/60/32/R was noted in the lungs of Balb/c mice after co-infection with 106 EID50 of both A/PR/8/34 and B/60/32/R. Interference did not occur when the dose of B/60/32/R was increased to 107 EID50 per mouse. When CBA mice were co-infected with 106 EID50 of both B/60/32/R and the influenza A ca reassortant R/34, or 106 EID50 of B/60/32/R,R/34 and A/Leningrad/134/57, interference did not occur. Interference could not be detected in mice following dual infection from serum responses to individual viruses.

Url:
DOI: 10.1016/0264-410X(94)90006-X


Affiliations:


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<div type="abstract" xml:lang="en">Abstract: Interference between pairs of cold-adapted (ca) influenza A and B vaccine reassortant viruses and between ca influenza B reassortant viruses and wild-type influenza strain A/PR/8/34 was studied in embryonated eggs and/or in the respiratory tract of three strains of mice. Interference in eggs between ca A and B reassortants occurred after 2 days but was masked by later cycles of growth. When doses of 106 EID50 of the reassortant viruses B/60/32/R and A/47/6/R were administered to outbred mice, interference with the growth of A/47/6/R occurred in the turbinates; interference with the growth of B/60/32/R did not occur. However, interference with the growth of B/60/32/R was noted in the lungs of Balb/c mice after co-infection with 106 EID50 of both A/PR/8/34 and B/60/32/R. Interference did not occur when the dose of B/60/32/R was increased to 107 EID50 per mouse. When CBA mice were co-infected with 106 EID50 of both B/60/32/R and the influenza A ca reassortant R/34, or 106 EID50 of B/60/32/R,R/34 and A/Leningrad/134/57, interference did not occur. Interference could not be detected in mice following dual infection from serum responses to individual viruses.</div>
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