Expert Answers
marbar57 eNotes educator| Certified Educator

Yes, apple cider vinegar is antiviral.  For thousands of years civilizations have discovered and used the healing powers of this liquid.  Hippocrates used it as an antibiotic.  During the Civil War, soldiers used it to prevent and treat pneumonia.  It was used during World War I to prevent infection in wounds.  Applied to the face, it stops the spread of acne and clears up the complexion. 

Today, studies have proven that apple cider vinegar can help with sinus infections, colds, flu, contact dermatitis, and acne, all of which can be virally caused.

A major catch, however, is that while vinegar may work as an antiviral, it doesn't kill as many germs as a full spectrum antibiotic does.