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As we approach the pandemic’s five-year mark, COVID 19’s threat has lessened, with experts likening it to the flu, though tracking cases remains complex. Subscribe to WCVB on YouTube now for more: http://bit.ly/1e8lAMZ Get more Boston news: http://www.wcvb.com Like us:…

### Article Details ### Title: Role of Vitamin A in the Immune System Authors: Zhiyi Huang, Yu Liu, Guangying Qi, David Brand ,and Song Guo Zheng Publisher: MDPI AG Creation Date: 2018-09-06 DOI: 10.3390/jcm7090258 DOAJ URL: https://doaj.org/article/e80549e79d6a4553b3d2f6d289b470b3 Source URL: http://www.mdpi.com/2077-0383/7/9/258…