This site was created during the Covid-19 pandemic to help people monitor coronavirus hotspots around the world and track the safety of local communities as the number of infections changed over time.
As the pandemic progressed, governments gradually reduced their monitoring efforts and JHU CSSE eventually stopped updating the underlying data repository. The tracker now displays the full historical data set from January 31, 2020 to March 9, 2023.
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The bar chart shows the number of newly reported cases each day. The line chart shows the totals over time.
"Total cases" (blue) are the total number of confirmed infections.
"Active cases" (orange) are an estimate of the number of people who are likely to still be infected. The estimate assumes cases last 2 to 6 weeks, with a 2-day lag in reporting.
"Died" (gray) are the number of reported deaths.
The "target" dotted line represents 10 new cases per 100,000 people, reported over a 14-day period.
"Smoothed" data is the moving average of the preceding 7 days.
"Recent surge" ranks locations by the growth rate of new cases over the past 14 days.
"Current hotspots" ranks locations using both the current level of active cases and the growth rate of new cases.
Cases per capita (case numbers normalized by population size) are useful for estimating the local severity of outbreaks. Total case numbers are useful for estimating the allocation of resources and supplies.
Use the bar chart to see and compare "second waves" of infections.
The number of reported cases over time is an imperfect approximation of disease prevalence because it's affected by testing rates, reporting delays, and other factors. However, it's the most up-to-date data available.
Occasionally you may see a drop or sharp increase in the cumulative number of cases. This usually means that the reporting agency has changed their criteria for certifying cases and the historical time series hasn't yet been adjusted. See the latest data source update notes and data issues.
This website is educational in nature. It is not intended to serve as the primary or sole basis for decisions regarding health, finance, policy, or any other use.
The software is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the software.