Polio can be circulating through a community long before anyone is paralyzed. Monitoring sewage for the virus lets public health officials short-circuit this 'silent transmission.'
Pakistan had only eight new diagnoses of polio in 2017. The virus' days look numbered – but health workers have their work cut out for them to eradicate the devastating disease once and for all.
Eradicating the last 1% of polio cases in the world requires an endgame plan centred on immunisation and surveillance.
The positive impact of the polio eradication initiatives on the continent can be felt across the health sector in other health programmes.
Nigeria's strategy to eliminate polio was so effective that it was duplicated to deal with ebola. So why did the country take so long to get off the list of polio-endemic countries?
It's been one year since the last polio case was reported in Africa. If the continent keeps this up, it could be declared polio free by 2018.