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.
More on interrogative pronouns... The personal pronouns are I, you, he, she, it, we, they, and who. More often than not (but not exclusively), they replace nouns representing people. When most people think of pronouns, it is the personal pronouns that usually spring to mind.