Guinea is currently facing an unprecedented Ebola outbreak, with 78 deaths from 122 cases since January.
There is a real risk of this exploding into an outbreak with hundreds of cases".
Ban also visited Liberia, which has suffered the most fatalities in the outbreak with more than 3,300 victims.
For months, nearly everyone involved thought the medical center had had a huge whooping cough outbreak, with extensive ramifications.
But they are not alone; in Wales two years ago we had an outbreak with nearly 1500 cases.
Three countries in west Africa Guineaea, Sierra Leone and Liberia – have borne the brunt of the latest outbreak with a combined death toll of nearly 5,000.
A team of officials from the health organization is in Guangdong, investigating the origins of the outbreak with the blessing of the Chinese government.
The US has the biggest outbreak, with 33,902 confirmed cases, followed by Mexico, with 10,262, and the UK third.
Hospital workers in Jakarta are struggling to cope with a worsening dengue fever outbreak, with almost 800 people admitted in a single day, officials said.
In another development, Unicef warned that Baghdad might be facing a cholera outbreak, with 101 new cases reported in recent weeks.
Medical staff and the emergency services have conducted a disaster preparation exercise this weekend to prepare for a potential outbreak, with hospitals now on standby.
