ORLANDO: Disney World is known as "The Most Magical Place on Earth" but as the Florida theme park reopened Saturday, it was counting on a bit of science - masks, social distancing, hand sanitizer - to stave off the coronavirus.

The state of Florida is one of the hardest-hit by a new wave of cases and deaths in the United States, already the most affected country in the world in terms of infections and fatalities.

On Saturday Florida reported its third-highest daily increase in cases, with 10,360 new infections, as well as 95 deaths.

Overall, the US has seen nearly 135,000 deaths out of 3.2 million cases.

In Orlando, Disney World reopened two of its four parks - Magic Kingdom and Animal Kingdom - after four months of closure. Epcot and Disney Hollywood Studios will open on Wednesday.

Several hundred people queued in the Florida heat ahead of the park's reopening - some sporting Mickey ears but all wearing masks, part of the park's new guidelines requiring them for both guests and employees.

Saturday's visitors had reserved their tickets in advance, allowing Disney to control the number of people in the park and accommodate for social distancing. Tickets are already sold out through July.

The park was carrying out temperature checks at the entrance and hand sanitizer was widely available. Disney said it was enforcing social distancing of six feet (two meters) at attractions and inside shops.

"By visiting Walt Disney World Resort you voluntarily assume all risks related to exposure to COVID-19," the park said on its website.

Gone are the park's famous parades which allow mingling with Disney characters, and also absent are the evening fireworks shows.

On social media, many criticized the park's reopening as Florida experiences an accelerated number of cases.

The state's Republican Governor Ron DeSantis began reopening Florida's economy in phases in May and June.

Top US infectious disease expert Anthony Fauci said Thursday that Florida had begun reopening before meeting the necessary criteria enabling it to safely do so.

DeSantis disputed the remarks, saying his decision to reopen was justified by figures at the time.

At the end of June the governor took a step backwards, ordering the closure of bars in an attempt to limit the spread of the virus, but cases have continued to climb nonetheless.

Meanwhile, The World Health Organization has urged countries grappling with coronavirus to step up control measures, saying it is still possible to rein it in, as some nations clamp fresh restrictions on citizens.

With case numbers worldwide more than doubling in the past six weeks, Uzbekistan on Friday returned to lockdown and Hong Kong said schools would close from Monday after the city recorded "exponential growth" in locally transmitted infections.

WHO chief Tedros Adhanom Ghebreyesus called on countries to adopt an aggressive approach, highlighting Italy, Spain, South Korea and India's biggest slum to show it was possible to stop the spread, no matter how bad the outbreak.

The health agency's comments came as US President Donald Trump was forced to cancel an election rally in New Hampshire, citing an approaching storm.

Trump has pushed to hold large gatherings against health advice as epidemiologists warn of the dangers posed by the virus moving through the air in crowded and confined spaces.