Birds which have had influenza could be partially protected against virulent variants such as H5N1 or H5N8," says Neus Latorre-Margalef.
One explanation could be what Neus Latorre-Margalef and her colleagues show in their study: that various viruses compete with one another as birds build up immunity and the duration of infection becomes shorter.
More knowledge is required for developing more effective vaccines," says Neus Latorre-Margalef.
Address for correspondence: Neus
Cardenosa Marin, Servei de Vigilancia Epidemiologica, Departament de Salut, Trav de les Corts 131-159, Pavello Ave Maria, 08028 Barcelona, Spain; email: neus