Guo, NL, Lu, DP, et al. Demonstration of the Anti-Viral Activity of Garlic Extract against Human Cytomegalovirus in Vitro. Chin Med J (Engl) 106(2)93-6.
This study was done in a petri dish on human tissue infected by a virus, in this case the human cytomegalovirus . It was found that the addition of garlic extract to the culture had an inhibitory effect on the virus which remained even after removal of the extract. It was also found that continuous addition of the extract had a more powerful effect
Wesa, KM, Cunningham-Rundles, S, et al. Maitake Mushroom Extract in Myelodysplastic Syndromes (Mds): A Phase II Study. Cancer Immunol Immunother 64(2)237-47. PMC4317517
This study done on 21 patients showed mechanisms by which the consumption of maitake mushroom extract increased immunity. It increased neutrofil and monocyte production as well as production of reactive oxygen species. All of these target pathogens and consequently increase immunity.