The 52-year-old, who moved to Spain from Pakistan three decades ago, has a tube in his neck allowing him to breathe — but preventing him from speaking.
Highly transmissible Omicron has swept across countries, forcing governments to impose fresh measures and scramble to roll out vaccine booster shots.
Experts said on Monday that an alleged hybrid coronavirus mutation dubbed "Deltacron" reportedly discovered in a Cyprus lab is most likely the result of a lab contamination, and not a new worrying variant.
In its latest weekly update on the pandemic, the UN health agency said on Wednesday that confirmed cases dropped 12% to more than 3 million and reported deaths declined 22% to about 7,600.
The health ministry said 4,313 people who tested positive for the virus in hospital had died as of 1600 GMT Friday while there were 41,903 confirmed cases as of 0800 GMT Saturday, up 3,735.
A chaotic scramble for desperately needed medical equipment and protective gear engulfed the United States, prompting intense squabbling between the states and federal government at a moment the nation is facing one of its gravest emergencies.
The 567 new deaths reported by the health ministry were slightly up from Monday's death toll and they take the total number of fatalities to 18,056 --- officially third in the world behind the United States and Italy.
Trump, who has reacted angrily to criticism of his administration's response to the worst epidemic in a century, has become increasingly hostile towards the WHO. The Geneva-based organisation had promoted China's "disinformation" about the virus that likely led to a wider outbreak than otherwise would have occurred, Trump said.
The halls are eerily quiet at Madrid's Reina Sofia, Spain's most visited museum, as a solitary art restorer looks after its star attraction -- Pablo Picasso's anti-war masterpiece "Guernica".
Anthony Fauci, head of infectious diseases at the National Institutes of Health, told Fox News the guidance on masks would be changed "because of some recent information that the virus can actually be spread even when people just speak, as opposed to coughing and sneezing."