We grow Organic Southern Highbush Blueberries (Vaccinium darrowii). While not technically a "vaccine" they are well-known as one of nature's finest immune system boosters.
https://www.psychologytoday.com/us/blog/comfort-cravings/202003/feeling-anxious-about-the-coronavirus-and-the-flu-eat
https://www.geisinger.org/health-and-wellness/wellness-articles/2018/01/19/14/09/6-foods-to-boost-your-immune-system-through-cold-and-flu-season
https://www.medicalnewstoday.com/articles/322412#which-foods-boost-the-immune-system
https://www.sciencedaily.com/releases/2013/09/130917125022.htm
https://www.captel.com/2018/07/health-benefits-of-blueberries/
https://academic.oup.com/advances/article/11/2/224/5536953
https://www.psychologytoday.com/us/blog/comfort-cravings/202003/feeling-anxious-about-the-coronavirus-and-the-flu-eat
https://www.geisinger.org/health-and-wellness/wellness-articles/2018/01/19/14/09/6-foods-to-boost-your-immune-system-through-cold-and-flu-season
https://www.medicalnewstoday.com/articles/322412#which-foods-boost-the-immune-system
https://www.sciencedaily.com/releases/2013/09/130917125022.htm
https://www.captel.com/2018/07/health-benefits-of-blueberries/
https://academic.oup.com/advances/article/11/2/224/5536953