Viral diseases are nothing unusual for humans. The body’s own immune system fights viruses with antibodies. It is a process that accompanies every human being throughout his or her life. Therapeutically, there are limited options for treating such viral diseases. Often one limits oneself to alleviating the accompanying symptoms until the immune system has won the fight against the viruses. Where the immune system shows difficulty in fighting a virus, therapeutic support can be provided. Several therapeutic options are currently being tested for COVID-19.