"Fortunately, vaccination also promotes a https://www.businessinsider.com/doctor-not-boosted-but-mom-is-getting-3rd-covid-shot-2021-11 that lasts for many months longer than the antibodies do, which means that even if vaccinated people do get a little sick , they are generally well-protected against the worst that COVID-19 can do."
From https://www.businessinsider.com/chart-shows-how-fast-covid-booster-shot-protection-kicks-in-2021-11?IR=T
Is the worst the head of the NP the worst that COVID-19 can do?
And if so, is the noun the worst plural in the NP the worst that COVID-19 can do?
anonymous Is the worst the head of the NP the worst that COVID-19 can do? Yes. anonymous And if so, is the noun the worst plural in the NP the worst that COVID-19 can do?
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anonymousIs the worst the head of the NP the worst that COVID-19 can do?
Yes.
anonymousAnd if so, is the noun the worst plural in the NP the worst that COVID-19 can do?
No. It's actually 'worst thing' that's implied.
CJ