The European Union was considering blocking US travellers as it reopens its borders to tourism.
France took its biggest step yet back to normality by allowing millions of children to return to school.
Around 100 flights from European countries landed at Spain's airports.
The crisis could provoke the region's "worst recession in history."
Elsewhere around the globe, clusters of infection were growing as governments relaxed restrictions.
President Jair Bolsonaro's government had stopped publishing the total number of deaths from the new coronavirus Friday.
In total, the cyberattack affected 11 Honda plants -- including five in the US, according to local media reports.
The announcement was made by the Brazilian Health Regulatory Agency (ANVISA), which will see 2,000 volunteers join the clinical trials.
As of 1900 GMT, a total of 400,581 deaths were recorded worldwide.
The striker's communications staff did not immediately respond to a request for comment from AFP.
The United States remains the hardest-hit nation in the world.
The WHO has been holding clinical trials to find a treatment for COVID-19, which has killed more than 382,000 people.
The focus now falls on Latin America, which passed one million cases this week.
London's Camden Market cautiously opened for the first time in 10 weeks.
The pandemic has devastated the global economy, which is facing its worst downturn since the Great Depression.
Confirmed US deaths stood at 100,396 late Wednesday, with nearly 1.7 million infections, according to the tally compiled by Johns Hopkins University.
Brazil has now confirmed a total of 24,512 deaths.
The US announced sanctions against a Chinese government institute and eight companies for human rights violations.
The phenomenon has become more pronounced as the pandemic progressed.
Brazil has now recorded more than 310,000 cases, with experts saying a lack of testing means the real figures are probably much higher.
The country has registered more than 290,000 cases and nearly 19,000 deaths so far.
The WHO said that 106,662 virus cases reported to the UN agency on Tuesday -- the most in a single day since the outbreak erupted in Wuhan in December.