A version of this story appeared in the April 7 edition of CNN’s Coronavirus: Fact vs. Fiction newsletter. Sign up here to receive the need-to-know headlines every weekday.

CNN  — 

As nations look to their leaders for guidance in this time of crisis, Britain’s Prime Minister Boris Johnson is waging his own personal fight with the coronavirus from a London hospital, where he has been moved to the intensive care unit and given oxygen after his symptoms worsened.

Johnson’s hospitalization has highlighted the lack of a formal line of succession in the UK government, which was accused of being slow off the mark to react to the pandemic. While Foreign Secretary Dominic Raab will deputize for Johnson “where necessary,” another key cabinet official sidestepped a question today about who held the “nuclear codes.

President Donald Trump described Johnson as a “good friend of mine” and seemed to suggest that he had rushed a mystery therapy to the Prime Minister, in one of the stranger moments of a short-tempered briefing on Monday, Stephen Collinson writes. Trump’s contempt for science and disdain for experts who question his political narratives are driving his increasingly defensive management of the pandemic – and the tension is only expected to grow as the election approaches.

In a rare moment of détente between political rivals, Democratic presidential front-runner Joe Biden spoke with Trump by phone yesterday to discuss the outbreak. It’s easy to forget that America is in the midst of a presidential race, but after courts halted Democratic efforts to delay the Wisconsin primary, voters there today will face this stark choice: safeguard their health or go to the polls.

YOU ASKED. WE ANSWERED

Q: What is hydroxychloroquine and can it be used to treat coronavirus?

A: Hydroxychloroquine is derived from quinine, which French chemists in 1820 isolated from the bark of the cinchona tree. In 1934, German scientists created the synthetic chloroquine as part of a class of anti-malarials. There have been indications that hydroxychloroquine is effective in treating or preventing Covid-19, but the tests haven’t endured the due diligence of extensive clinical trials. Still, Trump is pushing it. Here’s what you need to know about the drug.

More than 50,000 people have asked us questions about the outbreak. Send yours here. Are you a health care worker fighting Covid-19? Message us on WhatsApp about the challenges you’re facing: +1 347-322-0415.

WHAT’S IMPORTANT TODAY

‘The tip of the iceberg’

“If you die in my county, I will not know if you died of Covid-19.” This is the reality for coroners around the US, who are increasingly concerned that test shortages will leave many coronavirus deaths uncounted.

As the official US death toll passes 10,000, health experts are warning that the count could be dramatically underestimated due to a lag in data and misclassifications. “We really are just seeing the tip of the iceberg,” one doctor told CNN.

In the nation’s epicenter, New York City, where hospitals are overwhelmed, refrigerated trailers are storing the deceased and a Navy ship has been called in to treat patients, a councilman suggested it may soon be necessary to build temporary graveyards in public parks. Mayor Bill de Blasio said those claims were “totally false.”

How do you reopen the economy? Germany has a plan

It’s a marathon, not a sprint. That’s the approach recommended by a group of experts in Germany who envision a gradual revival of Europe’s biggest economy that would allow specific industries and workers to resume their activities, while steps are taken to prevent a resurgence of the virus.

Virus hunters zero in on culprit

Scientists are divided about the origins of the outbreak, but they agree on this: Anyone who claims to know the source of Covid-19 is guessing. Virus experts told CNN that there is zero evidence to back up various nationalist-tinged conspiracies, but they’re at odds over the once widely accepted theory that the virus originated at a wet market in Wuhan, China. To date, one possible culprit does seem likely: Bats.

State of emergency in Japan

In stark contrast to neighbors like Taiwan, which has brought the virus to heel, Japan has been criticized for its lax handling of the outbreak. Prime Minister Shinzo Abe has announced an unprecedented $989 billion economic stimulus package — 20% of Japan’s GDP — and declared a state of emergency, but he says “basic economic activity” will continue.

China reports no new fatalities

The country where the pandemic began recorded no new deaths yesterday for the first time since January. There were also no locally transmitted infections found yesterday; all new cases were imported from abroad. And tomorrow, Wuhan will finally lift its lockdown after three months.

ON OUR RADAR

  • A hopeful development in Italy — yesterday, there was a record daily increase (2,099) in the number of people who recovered from the virus.
  • Spain’s Prime Minister says the country has “reached the peak” of its coronavirus outbreak and could soon consider easing lockdown measures.
  • Some rare good news amid the world’s worst humanitarian crisis: Saudi Arabia has declared a ceasefire in Yemen, citing coronavirus fears.
  • With only one Covid-19 death, New Zealand isn’t just flattening the curve, it’s squashing it — but experts say it’s too early to celebrate.
  • A billionaire art collector is distributing 10 million face masks via free vending machines in Hong Kong.
  • Prince William and Kate made a special Easter video call to a UK school which is staying open for the children of healthcare workers. They wished they had worn their bunny ears.

TOP TIPS

TODAY’S PODCAST

“The majority of Americans are used to abundance … so telling someone: ‘It may not be there for you. It may be that we have to ration.’ That does not go over well.” – Arthur Caplan, Professor of Medical Ethics, NYU School of Medicine

As coronavirus cases continue to overwhelm hospitals, resources such as ventilators are in short supply. CNN’s Chief Medical Correspondent Dr. Sanjay Gupta speaks to NYU’s Director of Medical Ethics about some of the tough questions facing healthcare professionals on the frontline. Listen now.