Watanabe Clinic is an internal medicine clinic located in Horinouchi, Suginami Ward, Tokyo, offering services in English and barrier-free accessibility. To prevent the spread of COVID-19 and influenza viruses, powerful air purifiers are installed in the waiting area, rehabilitation room, and examination rooms. When people are present, indoor air is drawn in and viruses and bacteria are eliminated through special filters; when no one is present, ozone gas fills the space to neutralize airborne and surface viruses and bacteria. Influenza vaccinations are available without appointment starting from October. As a registered medical and testing institution with Tokyo, the clinic offers COVID-19 PCR and antigen testing, as well as influenza antigen testing. The infectious disease and fever clinic operates separately from general patients, after weekday morning and afternoon clinic hours, and after Saturday morning clinic hours. The clinic promotes the use of My Number health insurance cards, provides in-house prescriptions to reduce patients' economic burden, and actively uses generic medications to reduce out-of-pocket costs.