Isolation of two H1N2 influenza viruses from swine in France

Abstract

Samples collected in 1987 and 1988 in Brittany from influenza-infected swine made it possible to isolate and antigenically characterize two H1N2 recombinant viruses (Sw/France/5027/87 and Sw/France/5550/88). The former virus was cloned and reinoculated to swine to allow reproduction of the disease and reisolation of a strain similar to the original one. The serodiagnostic tests carried out on both the original sera and those from the experimentally infected animals confirmed that the virus was actually type Sw/H1N2.

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Serological studies of influenza viruses in pigs in Great Britain 1991–2

“…These viruses appear to be evolving in a different lineage to those of human viruses, and pigs therefore present a reservoir of virus which may in the future infect the human population. Furthermore, 14 % of pigs had been infected with both swine H3N2 and HINI viruses, leading to a potential for the reassortment of influenza virus genes following co-infection, as occurred in Japan in 1978 [21], Italy since 1985 [22] and France in 1987/8 [23]. Sera from positive animals reacted in HI tests with human HINI viruses predominantly with the prevailing strain in the human population (A/Taiwan/1/86).…”