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Over the last 2000-3000 years, physicians from early civilizations such as the ancient Egyptians, Greeks and Romans right up until the early 1900's were managing cases of infections without the aid of antibiotics. During Roman times, doctors treating gladiators with infected wounds wouldn't know what the cause of the problem was, but they would note signs such as inflammation and draining wounds.
These various remedies were made from herbs, plants, tree barks, mud, molds and acids or caustic liquids. Some of these treatments may have benefited the patient but probably many didn't. Honey was found to be a very good treatment of infected tissue and is even used in medications up to this day.
During wars and battles, more soldiers would die from infections that would spread throughout the body than from bullet wounds. This would be the case up until World War 1 as guns would propel bullets at lower velocities which would result in pieces of clothing entering the flesh together with the bullet. These pieces of clothing would introduce bacteria into the body and the infective process would start shortly thereafter. Dentists would manage infected teeth, due to root abscesses, by pulling these teeth out. This would help get rid of the cause of the pain and patients would actually be quite grateful.
Removal of infected tissue did end up being quite destructive to the patient though, often leading to severe disabilities and unflattering cosmetic outcomes.
The body's immune system
As humankind evolved then so did our immune systems. As we became exposed to more pathogens, our immune systems would be stimulated to produce antibodies to those harmful microorganisms. Conservative measures; such as rest,lowering the body's temperature with lukewarm baths and compresses or by making sure that the patient was well hydrated, would help to control the symptoms of the illness so that body had a good chance of fighting of the infection. Surgical procedures to remove infected tissue would also help the body launch an appropriate immune response in order to help combat the offending organism.
Methods that caused fatalities
Some methods not only were ineffective but they actually ended up killing patients. Of these methods included bloodletting, or blood draining, which was believed to allow "dangerous toxins" to be expelled by draining the patients blood. Patients would be drained of up to 2,5 litres of their blood which resulted in hypovolaemic shock. This method was recorded as being used by the ancient Egyptians and it's popularity peaked in the 18th and 19th century. There were also physicians who would treat patients with mercury and arsenic but these were quickly found to cause more harm rather than good.