As a supervisory nurse, Hasen Zadi and her colleagues provided the majority of patients day to day care, working back to back shifts.

Even on vacation days.

The number of hospitalized cases was on the rise daily.

Many of our colleagues got infected, but they continue their work more determinedly than before because they themselves have suffered this pain and they're trying to get better in order to take care of patients.

Separated from her family for 40 days, she described the first few months as a war scene.

Iran's Health Ministry says 60% of nurses have been infected with the coronavirus, and 10 months on Hassan's Ardis uniforms still consists of a mask, double gloves, a cap ah, hazmat suit and over shoes to removal.

These at the end of the day is delicate and complicated, she says, but necessary in order for her to safely go home.

Iran has been the worst hit country in the Middle East by the global pandemic.

It launched human trials off its first domestic covert 19 vaccine candidate on Tuesday, according to state media.

Tehran says it could help it defeat the virus despite US sanctions interfering with its ability to import vaccines.

State had a giant state affiliated conglomerate says production of the vaccine could reach 12 million doses per month.

Six months after a successful trial ends.

Thief first volunteers to take the vaccine where officials off the conglomerate and the daughter of its head and apparent effort to boost public confidence in the vaccine.