“By the second half the year, there should be several vaccines that are not just emergency approved, but fully approved, with very good safety, track records, regulatory data and so forth,” said McClennan. “I think after that point is when you’ll start seeing more requirements for getting vaccinations when people really want to move forward with reducing some of the distancing measures and getting more groups back together and things like that. But I think it’s much easier when you’re not dealing with emergency use, but you’re dealing with normal FDA-approved vaccines.”