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Infectious Diseases

The Department of Infectious Diseases treats infectious diseases caused by viruses, bacteria, and other pathogenic microorganisms, as well as infectious diseases affecting various internal organs. Many physicians in the department specialize in HIV infection, viral hepatitis, and bacterial and fungal infections.

Medical services

While most physicians specialize in HIV infection and AIDS: COVID-19, viral hepatitis including hepatitis B and C, and smear-negative tuberculosis, there are also physicians specializing in respiratory and urinary tract infection. In the inpatient wards, a team made up of a supervising physician with a wide-ranging knowledge and extensive experience and interns serve as attending physicians. They work together with nurses with many years experience in the care of patients with infectious disease.

Diagnosis and treatment policy

In addition to blood tests and chest x-ray examination, researchers test for bacteria using blood, sputum and urine, and perform antigen and antibody tests. Echocardiography, abdominal ultrasound, CT and MRI tests, bronchoscopy, and lymph node biopsy are also performed, if necessary, to accurately diagnose disease and identify pathogenic microorganisms. This is part of our effort to providing high-quality evidence-based treatment. State-of-the-art treatments for hepatitis B and C, and HIV infection are also available.


  • The Department of Infectious Diseases treats infectious diseases caused by viruses, bacteria, and other pathogenic microorganisms.
  • The department specializes in infectious diseases with a particular focus on viral hepatitis and HIV infection.
  • All physicians at the outpatient clinic possess specialized knowledge and experience in treating various infectious diseases, including HIV infections and internal diseases.

Target diseases

HIV infection, viral hepatitis (hepatitis B and C, etc.), tuberculosis, respiratory tract infections such as pneumonia and bronchial asthma, urinary tract infection, hepatobiliary infections such as liver abscess, digestive system infections, diabetic foot, cytomegalovirus infection, EB viral infection, imported infectious disease, parasitic infection, fever of unknown origin, etc.

Advanced treatments/ Specialized treatments

Designated AIDS center hospital

Our hospital has been designated by the national government as an AIDS center hospital staffed with many specialists in HIV infections and AIDS that can provide state-of-the-art treatment for these diseases.

Frequently performed tests and descriptions

  • Detailed bacteriological examinations
  • Specific antigen and antibody tests
  • Viral nucleic acid test
  • Abdominal ultrasound examination
  • CT and MRI tests
Takeya Tsutsumi

Takeya Tsutsumi


Department of Infectious Diseases, Infection Control and Prevention Service, Infection Control Center


M.D. , Ph.D.


virology, hepatology

Research Interests

Research on the molecular mechanism of pathogenesis by viral infection, especially hepatitis viruses and SARS-CoV-2 Clinical studies of viral infectious diseases



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Major diseases treated in this department and numbers of in- and outpatients

Disease name Number of inpatients (total of those in 2012 and 2013)
1 Viral hepatitis 8
2 HIV infection 15
3 Fever of unknown origin 6
4 Tuberculosis 4
5 Travel-related infectious diseases 3
6 Parasitic disease 2
7 Other infectious diseases 15

Number of outpatients(Infectious diseases 2,562)

Areas of expertise, treatment and examination methods

  1. HIV infection and AIDS
  2. Viral hepatitis
  3. MRSA infection
  4. Fever of unknown origin
  5. Tuberculosis

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