According to leading Flu experts, the UK should be on alert for a a new strain killer flu which could spread to ­Britain within 24 hours. They have gone as far as to dub it as “one of the biggest biological threats of our time”.

The alert has been raised as Britons started to fall victim to both seasonal flu and the swine flu at the same time. This rare incidence creates the high risk of a lethal mutation of the virus. This could lead to an “ominous” super-flu virus for which humans have almost no immunity, said medical scientists.

World-renowned infectious disease expert and president of the American Society of Tropical Medicine and Hygiene, Dr Peter Hotez  warned: “Highly infectious strains of the virus against which humans have little defence can spread from one continent to another within 24 hours.” He went to explain that fact scientists had detected the rare double-flu infection highlighted the need for extreme vigilance against new killer strains around the world. He added “We are required to remain vigilant against one of the biggest biological threats”.