Graphical Overview of Infectious Diseases
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About this page
On this page, you can visually check the epidemic status of major infectious diseases in Japan using weekly graphs.
Hover your cursor over the graph to see detailed figures.
How to read the data and important points to note
- ※The aggregated weekly number of cases reported in the National Surveillance System of Infectious Diseases is used. The latest data for epidemiological week 15 are as of April 15, 2026, and data from previous weeks have been republished.
- ※The shaded area shows the baseline range. The lower bound is the five-year average for each epidemiological week computed over a centered 7-week window, and the upper bound is the same average plus 2 SD. Both bounds were subsequently smoothed using a moving-average filter. For COVID-19, the baseline range was calculated using data from the past two years.
Detailed graphs can be foundhere.（You will be redirected to an external website.）
※Please use your browser's translation function.
【Notes regarding the display of external websites】
The detailed graphs shown in the linked pages are being created and published on a trial basis to explore methods for visualizing and utilizing data from both sentinel and comprehensive reporting in infectious disease surveillance programs. We are currently in the testing phase regarding the functionality and data display methods, and this is not an official information service provided by JIHS.
About the data source
- ・For periods when the annual report has not yet been published, we use data (provisional values) from the Weekly Infectious Disease Report (IDWR), which is updated weekly.
- ・For years for which annual reports have been published, the data will be updated to reflect the final figures in the annual reports.
- ・The provisional figures may change as further details are reviewed based on the submitted reports.
Disclaimer
- ・While we take great care to ensure the accuracy of our data, there may be display errors or delays in updates.
Regarding citation and secondary use
When citing or using the data, please clearly indicate the source of the original data (Annual Report on Infectious Disease Surveillance / Weekly Report on Infectious Diseases).