| vaccine failure caused an outbreak of equine influenza in croatia. | in april 2004 an outbreak of equine influenza occurred at the zagreb hippodrome, croatia. clinical respiratory disease of the same intensity was recorded in vaccinated and non-vaccinated horses. the equine influenza vaccine used in croatia at the time of the outbreak contained the strains a/equine/miami/63 (h3n8), a/equine/fontainebleau/79 (h3n8) and a/equine/prague/56 (h7n7). at the same time, the usual strains in vaccines used in europe were, in accordance with the recommendation of the world ... | 2009 | 18632226 |