The correct answer is A(H3N2). The majority of influenza infections during the 2017-2018 influenza season were caused by A(H3N2) viruses. However, according to a report from the CDC, the 2017-2018 influenza vaccine had limited effectiveness against this strain, which may have contributed to the spike in hospitalizations due to influenza-like symptoms as well as the prolonged influenza season.
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The majority of influenza infections during the 2017-2018 influenza season were caused by A(H3N2) viruses. However, according to a report from the CDC, the 2017-2018 influenza vaccine had limited effectiveness against this strain, which may have contributed to the spike in hospitalizations due to influenza-like symptoms as well as the prolonged influenza season.