From the Spanish influenza of 1918, to the SARs epidemic of the early 2000s - accounts from people who have suffered from viral diseases and those who have worked to find a cure.
How a group of US scientists led by Dr Jonas Salk discovered the first polio vaccine
In 1918 an extremely deadly form of influenza killed millions around the world
The first documented outbreak of the deadly disease occurred in the 1970s in Zaire
How the world battled a deadly respiratory disease in 2003.
A highly infectious virus appeared in Mexico in 2009 and rapidly spread round the world
A deadly new disease infected laboratory workers in a small town in West Germany in 1967.
