Iran’s death toll from Covid-19 has crossed 100,000 with 564 fatalities recorded in the past 24 hours, state TV said, as the highly contagious Delta variant of the coronavirus spreads in the Middle East's worst-hit country.

State television, citing Iran's health ministry, said the total number of confirmed Covid-19 infections had reached 4,587,683 including 31,266 new cases since Wednesday.

"The total number of deaths from Covid-19 has reached 100,255," state TV reported.

Reuters reports social media users inside and outside Iran have accused the Islamic Republic's clerical establishment of being slow to vaccinate people — only about five million of the 83m population have been fully inoculated.