The World Health Organization (WHO) their report this week, Recommended composition of influenza virus vaccines for use in the 2019 southern hemisphere influenza season and here is a summary of the report:

It is recommended that egg based quadrivalent vaccines for use in the 2019 southern hemisphere influenza season contain the following:
- an A/Michigan/45/2015 (H1N1)pdm09-like virus;
- an A/Switzerland/8060/2017 (H3N2)-like virus;
- a B/Colorado/06/2017-like virus (B/Victoria/2/87 lineage); and
- a B/Phuket/3073/2013-like virus (B/Yamagata/16/88 lineage).
It is recommended that egg based trivalent vaccines for use in the 2019 southern hemisphere influenza season contain the following:
- an A/Michigan/45/2015 (H1N1)pdm09-like virus;
- an A/Switzerland/8060/2017 (H3N2)-like virus; and
- a B/Colorado/06/2017-like virus (B/Victoria/2/87 lineage).
It is recommended that the A(H3N2) component of non-egg based vaccines for use in the 2019 southern hemisphere influenza season be an A/Singapore/INFIMH-16-0019/2016-like virus together with the other vaccine components as indicated above.
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