Let's talk about each option asked.
>Antibacterial has a strong effect against many bacteria (mostly not antibiotic-resistant).
>Antiviral has a strong effect against most viruses.
>Antifungal has a strong effect on many fungal infections.
Each option has known side effects.
For antibacterial, a person may experience vomiting, nausea, bloating, and loss of appetite.
For antiviral, a person may experience lightheadedness, tiredness, nausea, vomiting, and sometimes a skin rash.
For antifungals, since most are applied topically, a person may experience redness, itching, and rash.
So, the most virulent in the human cells are the antiviral drugs. It is needed to penetrate the cell to fully operate and access the infected human cell. Viruses have to get into the cell to replicate and produce more viruses.