Very embarrassing hit
It may be an error by word processing software. The correct sentence would be this:
“We would also add Day 2 and Day 7 tests for posts from all countries, control size of event, ensure those attending events are vaccinated and ensure adherence to COVID-19 protocols,”
or
“We would also add Day 2 and Day 7 tests from all countries, control size of event, ensure those attending events are vaccinated and ensure adherence to COVID-19 protocols,”