Phylogenetic analyses of HA and NA of an equine H5N1 isolate sequence in comparison to Egyptian human and avian isolates. a, HA gene b, NA gene. Human isolates are shown in blue while avian ones are shown in black whereas equine isolate is shown in red. All sequences were obtained from GenBank. Trees were generated using Neighbour-Joining method. The robustness of individual nodes of the tree was assessed using a bootstrap of 1000 resamplings in per cent (70% and higher) are indicated at key nodes.