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Because the pandemic is global we need global data to respond appropriately.

Several teams have taken on the responsibility to build these databases that all decision makers (i.e. everyone of us) now rely on.

👇A thread listing the reliable and open global databases.
A first important metric is *excess mortality* and it's easy to keep the overview here.
James Tozer and Martín González at The Economist built the *only* international database on excess mortality.

Yesterday they made it available:
Excess mortality does not take into account the cause of death and is only available for few countries (most lack the vital statistics).

Globally the most important metrics are therefore *confirmed cases and confirmed deaths*.

There are three global databases for these:
Daily updated data on the number of confirmed COVID19 cases and confirmed deaths due to COVID19 is published by the European CDC.
(The database is not just for Europe, but global.)

Download the daily data: ecdc.europa.eu/en/geographica…

Even more ECDC data: qap.ecdc.europa.eu/public/extensi…
The WHO also publishes data on confirmed cases and confirmed deaths and makes it available via their – now much improved – global data site:
covid19.who.int
Johns Hopkins University is the third big global database on confirmed cases and confirmed deaths.

Here is their GitHub repository where you can download the data and help their team to correct errors.
github.com/CSSEGISandData…
JHU also includes some subnational data.
*Policy responses:*

Researchers here at the University’s @BlavatnikSchool are maintaining a global database on country’s policy responses to the pandemic.

Here is their site: bsg.ox.ac.uk/research/resea…

We collaborate with them and publish their data here: ourworldindata.org/policy-respons…
There are many more databases on policy responses and related aspects.

@LukasLehner_ put together a very long and helpful list, he maintains a ‘tracker of trackers’:
*Public perceptions:*

The data by the #covid19study is global – more than 100,000 have filled out the survey – and the data is publicly available here:
covid19-survey.org/results.html
The researchers at Imperial College London maintain an international database with estimates of the *reproduction number (R0)* and other key metrics
mrc-ide.github.io/covid19estimat…
*Testing for COVID-19*

The only global database on testing for COVID19 is maintained by us at Our World in Data.

You find the regularly updated data, several visualizations and detailed descriptions of the sources here ourworldindata.org/coronavirus-te…
Which other international databases are helpful to understand the pandemic?
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