Infection with the 2009 pandemic H1N1 influenza virus during pregnancy promotes viral escape via rapid emergence of influenza virus mutations in mice. (September 2015) - Engels, G.L.; Hoffmann, J.; Thieme, R.; Alawi, M.; Indenbirken, D.; Grundhoff, A.; Mittrücker, H.W.; Gabriel, G.; Arck, P.C.