The second and third questions answered on the first floor are fine.

But the first question is wrong.

Penicillin has a very good antibacterial effect, the principle is that penicillin can destroy the cell wall of the bacteria, because the human cell is an animal cell, there is no cell wall, so penicillin has very little toxicity to humans. But since viruses don't have a cellular structure, penicillin can't help them.

So patients with influenza can't be injected with penicillin to inhibit the reproduction of the virus.