→By December 15, 2020
*** '''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.
=== By February 1, 2021 ===