Dr Eleanor Mair Williams, from the Skewen Surgery near Neath, south Wales, is only the second person to have caught swine flu in Wales.
The National Public Health Service (NPHS) for Wales said they were taking the unusual step of identifying Dr Williams, with her full consent, because of concerns that patients may not visit their GP if they fell ill for fear of catching the infection.
The NPHS has identified 21 people who were in close contact with her while she was ill. These include four staff, two social contacts and 15 visitors to her surgery on 1 June.
All the close contacts are well, have been offered antiviral medicine to prevent them getting flu and have been given advice about symptoms to look out for.
Elsewhere, Professor Hugh Pennington, a bacteriologist at Aberdeen University, has warned that over 1,000 people in the UK could have swine flu as many cases were going undetected. The official HPA total currently stands at 557.
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