Patients in Sutton and Merton are being refused antiviral drugs if they lose reference numbers issued by the new national swine flu hotline.
Health bosses have also warned sufferers to stay away from doctors and to obtain medication only through the National Pandemic Flu Service.
Schools expect to open for the new term in September but administrators are still making plans to minimise disruption in case of an outbreak.
Dr Martyn Wake, a local GP, said: “If prescribed antiviral medication from the phoneline, you will be given a unique reference number over the phone, so a ‘flu friend’ can pick it up.
“It is vital you keep a record of the reference number: if you lose it, the flu line won’t give another. If you go to your GP, pharmacy or A&E you will not get the help you need, and could infect others.”
Yvette Stanley, director for children, schools and families at Sutton Council, said: “We would only expect schools to take the decision to close if, for example, there was insufficient staff to maintain a safe environment for children.”
“In the event that schools have to close, they will do what they can to ensure pupils have access to work and can continue their studies at home.”
Councillor Tony Brett Young, executive member for young people, said “appropriate interim arrangements” would be made if school closures were required.
The new swine flu hotline is 0800 15 13 100 and further information can be found at nhs.uk or direct.gov.uk/pan.
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