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.
As the name suggests indefinite pronouns are pronouns that are not definite in meaning. In other words they are not specific in which noun they replace. They may be singular or plural, and must match the verb in number. There are two categories of indefinite pronouns. The first category includes pronouns that refer to a nonspecific noun.