When swine flu was first identitified it sent the world into a panic.
The World Health Organisation declared the H1N1 virus, as it came to known, a pandemic as it spread to 206 countries and territories around the globe.
More than 6,700 people have died, and over 70 million vaccines have been distributed.
As winter sets in across the northern hemisphere, Dan Nolan reports on the fears of some health workers and parent that vaccines themselves might be dangerous.
Source: Al Jazeera