If H3N2 viruses continue to circulate prominently, the 2014-2015 influenza season could be severe. In addition, most of the H3N2 viruses that have been antigenically or genetically characterized at CDC are different or drifted from the H3N2 vaccine virus.
Updated April 12, 2017. An indefinite pronoun is a pronoun that refers to an unspecified or unidentified person or thing. Put another way, an indefinite pronoun doesn't have an antecedent.
We use indefinite pronouns to refer to people or things without saying exactly who or what they are. We use pronouns ending in-body or-one for people, and pronouns ending in-thing for things : Everybody enjoyed the concert. I opened the door but there was no one at home. It was a very clear day. We could see everything.