Source: BBC News
Saudi Arabia says Muslims on the Hajj pilgrimage must have polio immunisation certificates if they come from states where the disease is endemic. The requirement affects people from Nigeria, India, Afghanistan and Pakistan, Saudi authorities say.
The World Health Organization (WHO) has warned there could be a resurgence of the virus unless it is eradicated.
Fears of a plot to sterilise Muslim girls have hampered polio vaccination campaigns in northern Nigeria.
For good measure, pilgrims arriving from Nigeria, Pakistan, Afghanistan and India will be given an extra dose of polio vaccine as they arrive in Saudi Arabia.