Latest data: 2026, week 44 (Oct 26 to Nov 1) Last updated: Nov 10, 2026 　 Next update (expected): Tue, Nov 17

Diseases to watch now (all Japan)

Where is it reported? (last 4 weeks)

Click a prefecture to see its details on the right.

Your area

"Very high", "High" and "Above usual" mean that national reports in the last 4 weeks are at least 5, 2.5 and 1.5 times the average for the same period over the past 5 years (only diseases with 10 or more reports in 4 weeks). "Rising" and "Falling" compare with the previous 4 weeks. Preliminary figures may be revised.
See the numbers (for professionals)
Preliminary figures may be revised later. "Usual" is the average for the same period (within 2 weeks) over the past 5 years. For diseases with few reports, small changes can look large in relative terms, so check the counts too. Click a disease name to see detailed charts.

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Weekly reported cases

Seasonality (weekly, by year)

Annual reported cases

Each disease has its own vertical scale. Area and period are set in the left menu.

Weekly reported cases by disease

Annual reported cases by disease

Each map has its own colour scale. Area and period are set in the left menu.

Map

Click a prefecture to select it; click it again to return to all Japan.

Sex (confirmed data)

Presumed place of infection (confirmed data)

Sex and place of infection are only in the confirmed data (to 2024). From 2025, preliminary totals are shown in grey.

Maps by sex (confirmed data)

Male

Female

Both maps share one colour scale, so they can be compared directly.

Maps by presumed place of infection (confirmed data)

Japan

Abroad

Unknown

Prefecture = the reporting prefecture. The Abroad map shows where cases infected abroad were reported, not the country of infection. Each map has its own colour scale.

About this site

This site shows reported cases of the notifiable infectious diseases that must be reported in full under Japan's Infectious Diseases Control Law, using data published by the Japan Institute for Health Security (JIHS). The data are retrieved and cleaned with the R package jpinfect.

The site is run by FIELDWORKERS Inc. It is not an official site of the Government of Japan or JIHS.

Data

  • Confirmed: 1999 (week 14) to 2024, as finalised in the annual reports.
  • Preliminary: from 2025, from the weekly reports. These may be revised later.
  • Breakdowns by sex and presumed place of infection exist only in the confirmed data.

How to read the data

  • Counts are by reporting week, not by week of onset or diagnosis. Weeks with public holidays often show fewer reports, followed by more the next week.
  • Prefecture means the reporting prefecture. The Abroad map also shows where cases infected abroad were reported.
  • Regional counts are the sum of their prefectures.
  • Diseases whose names changed over time are merged (e.g. Tsutsugamushi disease and scrub typhus, AIDS and HIV/AIDS).
  • Categories (I to V) follow the current law.
  • Figures are case counts, not incidence per population.

Disclaimer

Do not use this information to diagnose or treat any individual. If you are concerned about your health, please consult a medical professional. We take care over accuracy but cannot guarantee it. For official information, see JIHS.

Sources

  • Created by processing National Epidemiological Surveillance of Infectious Diseases data (JIHS)
  • jpinfect: GitHub, CRAN
  • Base map: GSI Tiles; prefecture boundaries: dataofjapan/land

Advertising and sponsorship

This site carries advertising and sponsorship. Advertisements are clearly labelled and do not influence the data or explanations.

Contact: FIELDWORKERS Inc.