Iran has ordered the closure of at least 620 schools in the country as a precaution against the spread of the H1N1 flu among Iranian students.According to Iranian Press TV, all of the 250 schools in Kashan, 370 schools In Isfahan, were shut down to abate the spread of the swine flu virus. According to a circular issued by Iran's Education Ministry, if 15 percent of the students in an educational institution are infected with the A/H1N1 flu, the body should be closed. The Iranian Health Ministry's latest reports indicate that swine flu has claimed the lives of 22 people across the country as the national tally of infections has risen to 1638.