(Bloomberg) -- Infections slowed in California, Arizona and Florida, three U.S. states battling outbreaks of the coronavirus. Health officials around the world are also trying to tackle a renewed increase in cases, with surges from China to Spain and Germany underscoring the difficulty of curbing the pandemic.

Senate Republicans presented a $1 trillion plan to bolster the U.S. economy. National Security Adviser Robert O’Brien tested positive for Covid-19, but the White House said his infection posed no risk to the president or vice president. Two Major League Baseball games were canceled after several players were infected.

Moderna Inc. received a second round of U.S. funding for an experimental vaccine for Covid-19 and kicked off its late-stage trial, while Pfizer Inc. and BioNTech SE said they will begin a later-stage study for their lead candidate. A British researcher said the effectiveness of vaccines will probably depend on annual doses.

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