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Illustration: Lazaro Gamio/Axios

Coronavirus contact tracing apps used in the EU should protect privacy and be compatible enough with one another to track the spread of the virus across borders, the European Commission wrote to its members on Thursday.

Why it matters: Contact tracing — or tracking down those who have interacted with a virus patient and advising them to self-isolate — is seen as a key step, along with widespread testing, in order to mitigate the spread of COVID-19.

Where it stands: In countries like France, Norway and Poland, Bluetooth is the primary strategy for contact tracing apps, the EU reports. The organization says that contact tracing should not rely on location data.

  • The Czech Republic is piloting using users' locations to build maps of where they have spent significant time within the last five days. The tech is operating in three regions, per the EU.
  • In the U.S., Apple and Google have proposed technology that notifies users if they've come into contact with someone with the virus, without sharing location data with the government.
  • MIT researchers are building a system that matches Bluetooth signals emitted from an infected individual's smartphone over 14 days to other phones, to find who they've come into contact with.

What they're saying: “Mobile apps can warn us of infection risks and support health authorities with contact tracing, which is essential to break transmission chains. We need to be diligent, creative, and flexible in our approaches to opening up our societies again," Stella Kyriakides, the EU health commissioner, said in a Thursday press release.

Background: Large-scale testing, contact tracing, a health system that can withstand new patient surges, and a sustained pattern of lowered infections are all necessary for countries to relax quarantines, the European Commission advised on Wednesday.

  • The ability of competing apps to work together "would allow for a more effective warning of people concerned and a more efficient public health policy follow-up," the Commission said on Wednesday.

Go deeper: Contact tracing is the latest coronavirus red flag

Go deeper

Scoop: Stephanie Ruhle to replace Brian Williams on MSNBC

Photo: Nathan Congleton/NBCU Photo Bank/NBCUniversal via Getty Images via Getty Images

MSNBC will soon announce plans to move morning anchor Stephanie Ruhle to the 11 pm ET hour that Brian Williams turned into an elite destination, two sources familiar with the move tell Axios.

Details: The 9 am ET hour, currently hosted by Ruhle, will become part of MSNBC's flagship morning show, "Morning Joe," which currently runs from 6 am to 9 am ET.

Oath Keepers leader denied bail on Capitol riot sedition charge

Oath Keepers co-founder Elmer Stewart Rhodes. Photo: Susan Walsh/AP

A federal judge ordered Oath Keepers leader Stewart Rhodes to remain jailed Wednesday until trial on charges stemming from the Capitol riot.

Why it matters: The judge said the most prominent far-right figure charged in the Jan. 6, 2021, insurrection had access to weapons and his alleged "continued advocacy for violence against the federal government" gave credence to prosecutors' view that, if released, Rhodes could endanger others.

Who in Congress is talking about Ukraine the most

Data: Quorum; Chart: Will Chase/Axios

Mentions of Ukraine or Ukrainian President Volodymyr Zelensky in congressional statements and social media posts have been on the rise — with nearly 1,000 already this month, according to data from Quorum.

Why it matters: The growing threat of a Russian invasion has been mirrored by a growth in Ukraine-related chatter.