I remember seeing a few articles on the mainstream Reddit boards (/r/coronavirus and /r/medicine) studies coming out of Israel and Japan. But some say it's not

I remember seeing a few articles on the mainstream Reddit boards (/r/coronavirus and /r/medicine) studies coming out of Israel and Japan. But some say it's not peer reviewed yet? https://www.science.org/content/article/having-sars-cov-2-once-confers-much-greater-immunity-vaccine-vaccination-remains-vital https://www.science.org/content/article/having-sars-cov-2-on...