Live vaccines consist of viable micro-organisms of attenuated virulence. The replication of these organisms within the body, provides a powerful stimulus to the immune system, without causing a significant illness in immune-competent individuals. Effective immunity therefore often follows a single dose.
Live, attenuated vaccines licensed in the UK include prior to 2013:
Oral typohid is a live vaccine but only available in the US and Australia.
Previously the list of live vaccines in the UK was usefully remembered with mnemonic MMR BOY, where the O stands for oral polio.
However now other live vaccines are used in the UK:
Reference:
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