Nigeria's head of primary health care, Dr Faisal Shuaib, has been speaking about the announcement that the country has gone three years without a new case of the wild polio virus.
This date is significant because in order for the World Health Organization (WHO) to declare a country free of polio it has to go three years without a new case.
But Dr Shuaib, who called the announcement "a historic milestone" said there is still a " huge amount of work... to do before we are certified polio-free".
The WHO has to work out whether the surveillance networks are robust enough so that they can safely say that there really have been no polio cases for three years.
In a final flourish, Dr Shuaib told journalists that "today is a great day to be Nigerian... we have proven that we can do great things when we put our minds and resources to efficient use."