A germ killer is an agent that is used to destroy or inhibit the growth of microorganisms, such as bacteria, viruses, and fungi. Common germ killers include drugs, antibiotics, ALCOHOL, and iodine. Drugs are chemical substances that are used to treat diseases or relieve symptoms. Antibiotics are a type of DRUG that specifically targets bacteria. ALCOHOL is a chemical compound that has antiseptic properties and can be used to disinfect surfaces. Iodine is a chemical element that can be used to kill bacteria and other microorganisms.