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. 1982 Sep;37(3):1119–1126. doi: 10.1128/iai.37.3.1119-1126.1982

Virulence of Avian Influenza A Viruses for Squirrel Monkeys

Brian R Murphy 1, Virginia S Hinshaw 2, D Lewis Sly 3, William T London 4, Nanette T Hosier 1, Frank T Wood 1, Robert G Webster 2, Robert M Chanock 1
PMCID: PMC347656  PMID: 7129631

Abstract

Ten serologically distinct avian influenza A viruses were administered to squirrel monkeys and hamsters to compare their replication and virulence with those of human influenza A virus, A/Udorn/307/72 (H3N2). In squirrel monkeys, the 10 avian influenza A viruses exhibited a spectrum of replication and virulence. The levels of virus replication and clinical response were closely correlated. Two viruses, A/Mallard/NY/6874/78 (H3N2) and A/Pintail/Alb/121/79 (H7N8), resembled the human virus in their level and duration of replication and in their virulence. At the other end of the spectrum, five avian viruses were restricted by 100- to 10,000-fold in replication in the upper and lower respiratory tract and were clearly attenuated compared with the human influenza virus. In hamsters, the 10 viruses exhibited a spectrum of replication in the nasal turbinates, ranging from viruses that replicated as efficiently as the human virus to those that were 8,000- fold restricted. Since several avian viruses were closely related serologically to human influenza viruses, studies were done to confirm the avian nature of these isolates. Each of the avian viruses plaqued efficiently at 42°C, a restrictive temperature for replication of human influenza A viruses. Avian strains that had replicated either very efficiently or very poorly in squirrel monkeys still grew to high titer in the intestinal tracts of ducks, a tropism characteristic of avian, but not mammalian, influenza viruses. These observations indicate that some avian influenza A viruses grow well and cause disease in a primate host, whereas other avian viruses are very restricted in this host. These findings also provide a basis for determining the gene or genes involved in the restriction of replication that is observed with the attenuated avian viruses. Application of such information may allow the preparation of reassortant viruses derived from a virulent human influenza virus and an attenuated avian virus for possible use in a live attenuated vaccine for prevention of influenza in humans.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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