The zoo found international notoriety in 2016 when the singer Cher launched a campaign to remove its shackled Asian elephant Kaavan
WHO chief Tedros Adhanom Ghebreyesus said research was at last providing "green shoots of hope" in treating the virus, which has killed more than 400,000 people worldwide and infected more than 8 million.
Trial results announced on Tuesday by researchers in Britain showed dexamethasone, a generic drug used since the 1960s to reduce inflammation in diseases such as arthritis, cut death rates by around a third among the most severely ill coronavirus patients admitted to hospital.
That makes it the first drug proved to save lives in fighting the disease. Countries are rushing to ensure that they have enough of it on hand, although medical officials say there is no shortage.
Some doctors were cautious, citing possible side-effects and asking to see more data.
A patient in Denmark received dexamethasone on Wednesday, local news agency Ritzau reported. The doctor who prescribed the drug said the medical profession was well acquainted with its side-effects.
The head of the WHO's emergencies programme, Mike Ryan, said the drug should only be used in those serious cases where it has been shown to help.
"It is exceptionally important in this case, that the drug is reserved for use in severely ill and critical patients who can benefit from this drug clearly," he told a briefing.
Britain has increased the amount of dexamethasone it has in stock and on order to 240,000 doses, Health Minister Matt Hancock said.
Methylprednisolone, a steroid similar to but less potent than dexamethasone, has been used in Sweden since March, a Stockholm-based doctor told media.
The steroid was introduced to standard practice after it proved effective on a coronavirus patient who wasn't showing signs of recovery with other treatments, Lars Falk, of the New Karolinska Hospital, told Sweden's Dagens Nyheter.
The dexamethasone study's results are preliminary, but the researchers behind the trial said it suggests the drug should become standard care in severely stricken patients.
The zoo found international notoriety in 2016 when the singer Cher launched a campaign to remove its shackled Asian elephant Kaavan
It is expected to roll out preventive and proactive strategies, train and qualify specialists, and prepare scientific research and forecasting studies
A wave of exceptionally hot weather has blasted parts of South and Southeast Asia this week
These ports will be used for take-off and landing of flying vehicles and serve as hubs for passenger pick-up, drop-off, and battery charging
The luxurious PORSCHE DESIGN HONOR Magic V2 RSR and PORSCHE DESIGN HONOR Magic6 RSR editions are available only through invitation, adding more exclusivity and uniqueness
Many motorists who have their vehicles written off will also look for a new one, driving the demand
Spot gold was steady at $2,317.41 per ounce after staying mostly in negative territory earlier in the day
It is likely to be humid by night and Friday morning over some coastal and internal areas