While the elderly and those with pre-existing medical conditions are the hardest hit by the virus, World Health Organization chief Tedros Adhanom Ghebreyesus warned that young people were also vulnerable.
Iran reported a record rise of 129 fatalities from the new coronavirus on Monday, bringing the total number of its death toll to 853 amid nearly 15,000 confirmed cases.
After downplaying the coronavirus as recently as last week, Iranian authorities said on Tuesday they had plans to potentially mobilise 300,000 soldiers and volunteers to confront the virus.
In Iran, hardliners have won not because of widespread support, but because of widespread apathy.
Interior Minister Abdolreza Rahmani Fazli says 42.57 percent of voter turnout in parliamentary election is "acceptable" as polls took place amid bad weather, air disaster, and coronavirus outbreak.
Polls shut at midnight (2030 GMT) after at least five extensions beyond the originally scheduled 6 pm (1430 GMT) closing time to allow a maximum number of people to cast their ballots.
The disqualification of some 9,000 potential candidates, most of them reformists and moderates, raised the possibility of lower-than-usual turnout.
Ayatollah Ali Khamenei, the country's supreme leader, told Iranians to "disappoint the enemy" by voting in Friday's parliamentary election, which comes during one of the most testing periods for Iran since the ouster of the pro-US shah in 1979.
The Iranian Guardian Council disqualified thousands of candidates, including reformists and conservatives, for parliamentary elections with low turnout expected.
The downing of the Ukrainian airliner, a harsh crackdown on protests and a drastic vetting system could mean Iranians stay home in large numbers on election day.
In Tehran's iconic Azadi Square, President Hassan Rouhani took the opportunity to remind the US their ally the Shah had to flee the country some 41 years ago.
The last time Ayatollah Ali Khamenei led Friday prayers at Tehran's Mosalla mosque was in February 2012, on the 33rd anniversary of the Islamic revolution and at a time of crisis over the Iran nuclear issue.
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