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There have actually been quite a few studies on this. Most show about an 80 percent cure rate. the problem with this is that their is selection bias in that the sickest patients may have refused this treatment and opted for surgery or not been offered the treatment to begin with.
Out of those who are cured, about 10 percent develop recurrent appendicitis within the year.
Theres also evidence that for patients with an abcess , antibiotics can be given and an appendectomy done 4-6 weeks later. A drain may or may not be placed to drain the abcess.
Theres not much in the literature regarding how long it takes to get better but 24-48 hours is common when treating abcesses. You will then notice a decrease in temperature and white blood cell count