Tamiflu tablets are prescribed for people with swine flu
Four patients in England have been confirmed as having swine flu, the Department of Health (DoH) has said.
The new confirmed cases are in London, the South East region and the West Midlands region.
Oxfordshire Primary Care Trust says the new cases include a two-year-old Oxford boy; he is linked to a woman already confirmed as having the virus.
The latest cases bring the total of confirmed swine flu sufferers in the UK to 137.
Three of the cases are linked to previously confirmed cases and one is a returning traveller.
The boy from Oxford who is among the latest cases is a "close household contact" of a 29-year-old woman from the city confirmed as having the virus on Sunday.
A spokesman for the DoH said: "The localised cases of swine flu found in the UK have so far been mild, and our strategy of containing the spread with anti-virals appears to have been effective in reducing symptoms and preventing further spread of infection.
"But we must not be complacent - it is right to prepare for the possibility of a global pandemic.
"The UK's arrangements are continuing to ensure that we are well-placed to deal with this new infection."