While acknowledging the difficult task set out for governments, WHO Director-General Tedros Adhanom Ghebreyesus said too many countries are headed in the wrong direction with the pandemic.
The Trump administration has said that the WHO ignored early signs of human-to-human transmission in China, including warnings from Taiwan, which, due to Beijing's pressure, is not part of the UN body.
"It's not over until there is no virus anywhere in the world," says WHO spokeswoman Margaret Harris.
Houthis' health minister said the government had been transparent about the number of confirmed cases and those who have recovered.
Countries where coronavirus infections are declining could still face an "immediate second peak," WHO warns, while UN health agency halts trial of hydroxychloroquine drug in patients citing safety reasons.
Global crises are no anomaly in recent history and multilateral institutions have generally emerged stronger in their wake.
World Health Assembly holds annual meeting as China and United States differ over the coronavirus pandemic which has killed more than 300,000 people.
The revelation raises serious concerns as the country already faces a major threat of Covid-19 outbreak in the backdrop of its health infrastructure which remains in shambles due to the years of war.
Trump suspended US contributions to the World Health Organization on April 14, accusing it of promoting China's "disinformation" about the coronavirus outbreak and saying his administration would launch a review of the organization.
The WHO has temporarily paused its movements in northern areas due to "credible threats and perceived risks which could have an impact on staff security", it said in response to a Reuters' query, adding that operations have not been suspended.
Prime Minister Imran Khan is right to be afraid of economic devastation, but sweeping the healthcare emergency under the rug won't fix it.
The World Health Organization warned governments against issuing "immunity passports" or "risk-free certificates" to people who have been infected as their accuracy could not be guaranteed.
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