Interferon treatment for HPV infection is done in a course of 30 days. Generally after 30 sessions, prompt testing is required to clarify whether HPV has turned negative, and treatment can be stopped once it has turned negative. However, if the test reveals that the HPV has not turned negative, it is likely that a second course of treatment will need to be started, i.e. 60 days, but there is usually no specific time limit. So you need to determine whether to use 30 or 60 days depending on the HPV test. Currently, HPV treatment is based on interferon therapy, but the application of interferon for treatment can cause adverse effects, and common adverse effects include fever, fatigue, and malaise. Therefore, most patients are reluctant to apply interferon for a long time, but it is still necessary to adhere to interferon for a sufficient period of time when applying it for treatment.