In terms of time, most experts agree that a vaccine for H1N1 was achieve in a very fast time. However in the rush to get a vaccine for H1N1, there are now questions about just how safe is the vaccine.
In Singapore, there are 27 reported cases of people having adverse reactions to the H1N1 vaccine with at least 1 serious case. While all the cases in Singapore have been non-serious, there had been reports all over the world about people having side-effects from the vaccine. A particular batch of the swine flu vaccine has been suspended from use in Canada while at least 2 deaths in China are suspected to be due to adverse effects to the vaccine.
Still I don’t think Singaporeans should be too worried. Currently there are at least 65 million doses of the swine flu vaccines around the world and for every 10,000 doses of vaccines administered, there had been only one report case of adverse effect. By any standard, 1 in 10,000 is a pretty record.