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→By May 15, 2021
*** '''Topicality''' (almost sufficient): Vaccines are a subject of discussion these days with potential coronavirus (COVID-19) vaccines in the works.
=== By May 15, 2021 (start/continue any time) ===
* [[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)