> Again, if there should be some issue with the supply chain, then the first dose could be 'wasted'. It's not "wasted". As noted in the article, the first dos

> Again, if there should be some issue with the supply chain, then the first dose could be 'wasted'. It's not "wasted". As noted in the article, the first dose alone is ~50% effective; the second dose is required to boost that to ~93%. So, it's a tradeoff between vaccinating n people at 93% effectiveness versus 2n people at 50% effectiveness.