Officials confirmed that the disease has spread to Britain with two people being treated for swine flu in an isolation unit at Monklands Hospital in Lanarkshire, Scotland.
Fears were growing last night that the virus could cause a flu pandemic as a series of countries confirmed cases.
Officials in Mexico – the centre of the outbreak – said there were 1,455 probable cases and 149 confirmed deaths.
Cases have also been confirmed in Spain, Canada, and several states in the USA. More are suspected in New Zealand, Israel and Colombia. Four people in the Irish Republic were being tested for the virus.