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→By March 15, 2021 (start/continue any time)
*** '''Time since last update''': The timeline was last updated 2018-06-01, so it is a little over two years old. This passes the minimum threshold of one year, but is not enough to be sufficient for an expansion.
*** '''Topicality''' (almost sufficient): Vaccines are a subject of discussion these days with potential coronavirus (COVID-19) vaccines in the works.
* [[Timeline of influenza]] (expansion; '''incremental expansion only'''; add a few rows for recent developments including interaction with COVID; do not spend effort expanding historical portions of timeline)
=== By May 15, 2021 (don't start more than 90 days before due date) ===
