Most of you may have once read the story of the four thieves
The plague was a bacterial infection and not a virus but as no one knows how this formula really worked maybe a company should have tried to make this a well and try it also during our viral epidemic.
VINEGAR OF THE FOUR THIEVES To ward off cold and flu This is an old eclectic recipe (one of many versions) once used to ward off the plague. 1 pint apple cider vinegar Big pinch of wormwood herb Big pinch of meadowsweet herb Big pinch of wild marjoram Big pinch of sage A few juniper berries 15 cloves ½ ounce elecampane root ½ ounce angelica root ½ ounce rosemary leaf ½ ounce of horehound herb Place all ingredients into a mason jar, seal tightly, and store the mixture for 2 weeks in a cool, dark place, shaking each day. Then strain the mixture well and bottle it up. Store it in a cool, dark place. Take 1 teaspoon of vinegar orally to prevent
Pursell, JJ. The Herbal Apothecary: 100 Medicinal Herbs and How to Use Them (p. 235). Timber Press. Kindle Edition.