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Children in Spain were allowed to go outside on Sunday for the first time since a nationwide lockdown aimed at slowing the spread of the novel coronavirus began six weeks ago.

By the numbers: The coronavirus has infected over 2.9 million people and killed over 200,000, Johns Hopkins data shows. More than 829,000 people have recovered from COVID-19. The U.S. has reported the most cases in the world (more than 940,000 from 5.1 million tests), followed by Spain (over 223,000).

What’s happening: Australian Health Minister Greg Hunt announced a new coronavirus tracing app on Sunday that the government hopes at least 50 percent of the population will use. A top health official said the app is “only for one purpose, to help contact tracing,” as he sought to reassure Australians on privacy issues.

• China reported 11 new cases and no deaths on Sunday. It’s been 10 days since the country reported any deaths. China’s reported infections and deaths have been treated with suspicion by foreign leaders and the CIA.
• Argentina is extending a nationwide shelter-in-place order that was due to expire Sunday until May 10, President Alberto Fernandez said on Saturday, per Reuters. The country has confirmed over 3,700 cases, according to Johns Hopkins.
• Spain will gradually ease nationwide stay-at-home restrictions starting May 2 if coronavirus cases continue to decline, Prime Minister Pedro Sánchez said Saturday.
• British Prime Minister Boris Johnson plans to return to work on Monday after recovering from the coronavirus.
• The World Health Organization said Saturday there is “no evidence” that people who recover from COVID-19 and have antibodies are protected from a second infection.
• India announced it will be easing lockdown measures for its 1.3 billion people in the areas outside of hotspots — providing some relief for locally owned businesses and daily wage workers.
• The director of Israel’s foreign intelligence agency, Mossad, said in a briefing to health care officials on Thursday that Iran and its regional allies are intentionally underreporting cases and deaths from the coronavirus.
• Brazil and Ecuador are becoming coronavirus epicenters in Latin America, as prolonged lapses in tracking and testing have led to severely undercounted death tolls, the Washington Post and the N.Y. Times report.
• New Zealand’s level 4 lockdown measures requiring non-essential workers to stay home have been extended to 11:59 p.m next Monday, when the country moves into a still-strict level 3. NZ reported just three cases on Thursday.
• Pakistan has decided to keep mosques open during the fasting month of Ramadan, which began Thursday, as cases continue to climb, AP reports.

The big picture: The world faces its gravest challenge in decades, but geopolitical tensions won’t wait until it’s over. Trump’s threat on Wednesday to “destroy” Iranian boats that harass U.S. ships comes amid arrests of Hong Kong pro-democracy activists and clashes in Afghanistan that could further undermine peace there.

Between the lines: Policy responses to the crisis have been every-country-for-itself and — in the case of the U.S. and China — tinged with geopolitical rivalry.

• But the scientific work under way to understand the virus and develop a vaccine has been globalized on an unprecedented scale.

Coronavirus symptoms: Fever, cough, shortness of breath.