Before revision: Avian influenza HA preferentially binds to alpha-2,3 sialic acid receptors, while human influenza HA preferentially bind to alpha-2,6 sialic acid receptors.
After revision: Avian influenza HA preferentially bindss to alpha-2,3 sialic acid receptors, while human influenza HA preferentially bind to alpha-2,6 sialic acid receptors.