In a press briefing on Monday, Sima Sadat Lari said 189 patients died of the novel coronavirus from Sunday to Monday, increasing the overall death toll to 18,616.
The spokeswoman said 286,642 patients have so far recovered from COVID-19, but 3,992 are still in critical conditions because of more severe infection, according to Tasnim News Agency.
Lari added that so far 2,711,817 COVID-19 tests have been taken across the country.
She also said more than 2,711,000 coronavirus diagnostic tests have been carried out in Iran so far.
New figures in recent days have shown a significant decrease in the number of deaths and infections across the country.
President Hassan Rouhani on Sunday called on people to continue observing the health protocols.
He said all people must observe the health protocols and social distancing at least for the next six months until a safe and effective vaccine is developed and widely distributed.
The Iranian president added that the government has currently no plans to intensify restrictive measures as any decision in this regard may cause fear among people and affect their mental health.
Iran, the worst-hit country from the coronavirus in West Asia, has been battling a resurgence of the virus, with official figures showing a rise in both new infections and deaths since a two-month low in May.
This prompted authorities to make wearing masks mandatory in enclosed spaces and reimpose restrictions lifted gradually since April to reopen the country’s sanctions-hit economy.