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Coronavirus Disease (COVID-19) Situation Report in Japan

Confirmed cases of COVID-19 in Japan. Data provided by the Ministry of Health, Labor and Welfare.

By Kazuki OGIWARA (Toyo Keizai Online Editor)


JAPANESE

Nationwide Situation

Tested Positive


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TOTAL
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Data source: MHLW Open Data. On and after 8 May, the data source was changed. See this link or notes below for further information. READ MORE

Active Cases


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Data source: MHLW Open Data. On and after 8 May, the data source was changed. See this link or notes below for further information. READ MORE

Discharged


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Data source: MHLW Open Data. On and after 22 April, cases which MHLW is still confirming reports from prefectures are included. On and after 8 May, the data source was changed. See this link or notes below for further information. READ MORE

Critically Ill


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Data source: "Coronavirus disease 2019 (COVID-19) situation within and outside the country" > "Critically ill" by MHLW. The former title was "Hospitalized with a ventilator or intensive care unit". See this link or notes below for further information. READ MORE

Deaths


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Data source: MHLW Open Data. On and after 22 April, cases which MHLW is still confirming reports from prefectures are included. On and after 8 May, the data source was changed. The number of deaths on June 19 includes the 13 patients who were PCR tested positive but died from diseases other than COVID-19 before that day in Saitama. See this link or notes below for further information. READ MORE

PCR Tested


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Data source: MHLW Open Data. On and after 3 March, tests for those who have been in close contact with infected person are included. On and after 7 May, the number does not have continuity with the past because Tokyo changed its data definition (see notes on PCR Tested in Tokyo for further details). See below for further information such as definition or notes.READ MORE

PCR Tests


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Data source: MHLW Open Data. On weekends and holidays, the number of PCR tests may be announced as "0" because MHLW did not receive the report, even if tests have been performed. The past data will be corrected if the number of previous tests was known. If not, the number of tests on weekdays and holidays will be added on the next weekday. The most recent few days may not be updated since dates containing "under investigation" items are not displayed. The dates are based on when the results of the tests were known. See below for further information such as definition or notes.READ MORE

Effective Reproduction Number


Formula: (New cases in past 7 days / New cases in 7 days before that) ^ (mean generation time / length of reporting interval). Mean generation time is supposed to be 5 days, and length of reporting interval is supposed to be 7 days. For the purpose of understanding current trends in real time, this formula is simplified and based on reporting dates. Note that this formula is a simplified version and may be affected by reporting delays. Model and supervised by Professor Hiroshi Nishiura of Hokkaido University Graduate School of Medicine. Refer to GitHub repository published by Prof. Nishiura for further details.READ MORE

Tested Positive By Age


"Unknown" includes undisclosed or under confirmation. The numbers of serious cases are not displayed here because MHLW has stopped publishing it (See Frequently Asked Questions for further information).READ MORE

Prefectures

Each Prefecture

Tested Positive in


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The data is based on transcription of the prefectural disclosures by MHLW. See chart annotations in "Nationwide Situation" section or footer notes for further information such as definition or notes.READ MORE

Discharged in


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TOTAL
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The data is based on transcription of the prefectural disclosures by MHLW. See chart annotations in "Nationwide Situation" section or footer notes for further information such as definition or notes.READ MORE

Deaths in


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TOTAL
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The data is based on transcription of the prefectural disclosures by MHLW. The number of deaths on June 19 in Saitama includes the 13 patients who were PCR tested positive but died from diseases other than COVID-19 before that day. See chart annotations in "Nationwide Situation" section or footer notes for further information such as definition or notes.READ MORE

PCR Tested in


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TOTAL
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The data is based on transcription of the prefectural disclosures by MHLW. On weekends and holidays, the number of PCR tests may be announced as "0" because MHLW did not receive the report, even if tests have been performed. The past data will be corrected if the number of previous tests was known. If not, the number of tests on weekdays and holidays will be added on the next weekday. On and after 18 June in Hyogo and 21 June in Shizuoka, the number includes tests covered by private testing institutions. The number in Tokyo includes medical insurance inspection results from 7 May, Antigen tested positive from 13 May, and Antigen tested negative from from 17 June. See Frequently Asked Questions for further information. Aichi in 3/16-22 excludes number of Nagoya city. Akita in 3/11 is the number of only Akita city. The figures for Chiba are only counted from 3/21, Osaka from 3/22, and Kanagawa from 3/23. See chart annotations in "Nationwide Situation" section or footer notes for further information such as definition or notes. READ MORE

Effective Reproduction Number in


In prefectures with fewer cases, a few case variations may bring a large fluctuation of effective reproduction number. In uncountable cases, such as zero new positives in the previous week, the number of effective reproduction number is also assumed to be zero. See chart annotations in "Nationwide Situation" section or footer notes for further information such as definition or notes. READ MORE