Scotland has seen its number of swine flu cases rise to 337 after 26 new patients were announced.
The majority - 18 - of the new instances of the virus are in NHS Greater Glasgow and Clyde. Three new cases are in NHS Highland, two in NHS Lothian, and three in NHS Lanarkshire.
There are nine people being treated in hospital, all of them in the Strathclyde area.
A further probable case is being investigated in NHS Grampian in addition to the 659 "possible" cases being probed in Scotland.
The announcement came as the World Health Organisation raised the threat level to “phase six”, classifying swine flu as a global pandemic.
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Scotland’s swine flu strategy has been changed accordingly. Health experts will now use clinical diagnosis rather than laboratory tests in high probability cases. Dispensation of antiviral drugs will continue but be complemented by targeting those groups most at risk of contracting the virus.
Announcing the new cases, Health Secretary Nicola Sturgeon said most sufferers were showing only mild symptoms. She explained: "Scotland is not unique in seeing a continuing rise in cases - this is happening in countries around the world. As in Scotland, the vast majority of people are experiencing relatively mild symptoms.
"We are still working hard to slow the spread of the virus and this policy has been successful in limiting transmission of the virus.
"However in areas where we have larger clusters and where there is evidence of community transmission - such as in Dunoon, Glasgow and Paisley - we are introducing greater flexibility to our approach. This will better target the measures for containing the virus towards those who are at greatest risk."
A pupil at St Vincent's Primary in Carnwadric, Glasgow, has also tested positive for the virus. As a result the composite P5/P6 class is being sent home for a week and offered Tamiflu.
In addition, an itinerant music teacher from North Lanarkshire has been diagnosed with swine flu. As a result, 41 pupils at Carluke High, St Andrews and St Brides, Calderglen High and Craighead School have been asked to stay at home for a week and offered Tamiflu.
