Serotherapy is a medical treatment that involves the use of serum, which is a component of blood that contains antibodies. This therapy is often used to provide passive immunity to individuals who have been exposed to certain infections or toxins. By administering serum from a person or animal that has already developed immunity, serotherapy can help the recipient fight off diseases more effectively. One common application of serotherapy is in the treatment of snake bites, where antivenom serum is used to neutralize the venom. Additionally, serotherapy can be utilized in cases of severe infections, such as diphtheria or tetanus, to provide immediate protection while the body develops its own immune response.