There are three major reasons why SARS-CoV-2, the novel coronavirus, will never be eradicated.
From 2000 to 2018, the global incidence of measles fell by two-thirds, and more than 23 million lives were saved by vaccines. This good news, however, is tempered by disturbing regional trends. Over the same time period, measles incidence doubled in Europe and increased 11X in the Americas.
When is it safe to stop vaccinating against measles? Or against other rare and infectious diseases? In short, vaccinating against them can cease once the threat of future transmission is deemed sufficiently low.