@article{:/content/10.2807/ese.14.46.19409-en, author = "Fereidouni, S R and Beer, M and Vahlenkamp, T and Starick, E", title = "Differentiation of two distinct clusters among currently circulating influenza A(H1N1)v viruses, March-September 2009", journal = "Eurosurveillance", year = "2009", volume = "14", number = "46", eid = 19409, pages = "", url = "https://www.eurosurveillance.org/content/10.2807/ese.14.46.19409-en", doi = "https://doi.org/10.2807/ese.14.46.19409-en" }