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.
It's useful to know about the various types of pronouns so that you can know when to use which type, and so that you can double check your writing to ensure you've used your pronouns correctly. One commonly used type of personal pronoun is the subjective case pronoun, which is sometimes also referred to as a nominative case pronoun. Subjective case pronouns are pronouns that act as subjects of sentences. The subject of a sentence is what the sentence is about.