The World Health Organisation (WHO) recommended in its recent report (dated 28 September 2017) that trivalent (3-strain) influenza vaccines for use in the 2018 southern hemisphere influenza season contain the following influenza vaccine viruses:

an A/Michigan/45/2015 (H1N1)pdm09-like virus
an A/Singapore/INFIMH-16-0019/2016 (H3N2)-like virus; and
a B/Phuket/3073/2013-like virus (from the influenza B/Yamagata lineage vaccine virus).

In addition, WHO has recommended that quadrivalent (4-strain) influenza vaccines containing two influenza B viruses, contain all of the above three …