就係有好似你提及個分類"unvaccinated partly vaccinated fully vaccinated"
但係有啲人有段時間冇打,打1針,未打齊針,或者打咗當地not approved嘅疫苗都係計unvaccinated
例如:
//For the purposes of this guidance, individuals are considered:
not vaccinated if they have not completed any shots, have completed one of two shots in a vaccination series, have completed a vaccination series but not the 14-day waiting period, or have been vaccinated with a vaccine that is not WHO-approved. //
https://www.binghamton.edu/health/covid-19/vaccinations/vaccine-faq.html
CDC都好似曾經咁做,之後又再改definition
//Unvaccinated people refers to individuals of all ages, including children, that have not completed a vaccination series or received a single-dose vaccine."//
https://vets.nysvms.org/communities/community-home/digestviewer/viewthread?MessageKey=e6709afe-1c70-470f-ac80-a9add437ce70&CommunityKey=8e26d212-e328-49e7-8339-c135a47f4f42&tab=digestviewer
就係有呢個定義亂嘅問題囉