Isolation of swine-like influenza A(H1N1) viruses from man in Switzerland and The Netherlands.

Swine influenza A (H1N1) viruses were isolated from two people in Switzerland and one in the Netherlands in early 1986. In haemagglutination-inhibition and neuraminidase-inhibition assays, the three viruses were closely related to one another and to the A/New Jersey/8/76 strain. The Swiss patients showed only mild symptoms, whereas the Dutch patient suffered from severe pneumonia.