Olive leaf extract is a Natural way to fight viruses, excellent antiviral herb
Are you looking for how to boost your immune system naturally?
Olive Leaf Extract Immune system booster
Extracts from olive leaves have been shown to treat infection caused by a large number of viruses as well as bacteria, parasitic protozoans, and fungi.
A phytochemical in olive leaf, call oleuropein, is able to stop viruses in their tracks. Oleuropein neutralizes the enzymes that are important for the virus to replicate itself and spread. Oleuropein also has the ability to interfere with the critical amino acid production essential for viruses.
Olive leaf extract is best way to boost your immune system naturally.

Oleuropein in Olive and its Pharmacological Effects
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3002804/

Point 5.6. Antiviral effect
In a U.S. patent, it has been claimed that oleuropein has potent antiviral activities against herpes mononucleosis, hepatitis virus, rotavirus, bovine rhinovirus, canine parvovirus, and feline leukemia virus [69]. Studies have also shown that oleuropein exhibits a significant antiviral activity against respiratory syncytial virus and para-influenza type 3 virus [70].
more info at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3002804/