28 September 2017
Recommended composition of influenza virus vaccines for use in the 2018 Southern Hemisphere influenza season. It is recommended that trivalent vaccines for use in the 2018 influenza season (Southern Hemisphere winter) contain the following:
an A/Michigan/45/2015 (H1N1)pdm09-like virus;
an A/Singapore/INFIMH-16-0019/2016 (H3N2)-like virus;
a B/Phuket/3073/2013-like virus.
It is recommended that quadrivalent vaccines containing two influenza B viruses contain the above three viruses and a B/Brisbane/60/2008-like virus.
Source: World Health Organization