The country is one of three hot-spots outside China causing concern that the virus could be becoming a pandemic.
The deputy minister, Iraj Harirchi, on Monday denied covering up the scale of the outbreak. He appeared in physical discomfort as he spoke to reporters.
Iran has reported 95 cases, but the actual number is thought to be higher.
The director general of the World Health Organization (WHO) has said the sudden increase in cases in countries outside China is "deeply concerning".