- Covid-19 has infected more than 2.25 million people and killed at least 154,000 worldwide, according to Johns Hopkins University.
- The World Health Organization has warned there's no evidence to suggest the presence of antibodies in blood can determine whether someone has immunity.
- US President Donald Trump unveiled new guidelines to help states loosen restrictions. He told governors it's their decision on when and how to reopen.
What you need to know
Scientists work to validate antibody tests from recovered Covid-19 patients on April 10 in New York City. Misha Friedman/Getty Images
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