Well.... of course the article did not provide a link to the study, so it will take me a while to chase it down
(why do they fear their readers checking the original source?)
added: the study (as a pre-print, ain't peer reviewed yet,hasn't been accepted by a journal) is available here: https://www.medrxiv.org/content/10.1101/2021.06.01.21258176v2.full
BUT "studies have shown" that previously-infected people who later receive the vaccine have a higher/longer level of protective antibodies circulating in their bloodstream. People who do NOT receive the vaccine show a steady weakening of their self-protection. The vaccine kicks their defensive responses back up to "high".
--dick (i'll try to find a reference to the more-antibodies studies i mention... after i read the Cleveland)
((just heard on radio: Seattle is now up to 70% of the population fully vaccinated))
And comparative figures on infection and death rates of 3 months ago compared to now, now that they have reached the 70% vaccination figure are??