Over 65s, people with heart and lung conditions and NHS staff are being urged to get their free flu jab.
The Scottish Government has launched an advertising campaign to maximise uptake of the annual vaccination.
Health Secretary Nicola Sturgeon voiced concern that some people did not think it necessary to get their jab, and others did not know they were eligible.
"Don't let the flu turn on you" warns that flu is much more than a cold and can cause further health problems.
Ms Sturgeon said: "Quite often older people and those with long term medical conditions such as chronic breathing and heart problems manage their condition well and can feel they are in good health.
AT RISK GROUPS
"It is understandable that some people may feel it's not necessary to get their jab but it's vital that as we approach the winter months, those at greater risk are prepared."
The £475,000 campaign runs until 30 November and the adverts will be used on radio, television and billboards.
Chair of the National Flu and Pneumococcal Group, Dr Jim McMenamin, warned about the potential consequences of not getting the jab.
He said: "Every year people develop complications from flu that may mean weeks of treatment from their GP or, worse still, admission to hospital.
"Sadly we still see a number of people who die from the complications of flu every year."
Lindsay Scott, of Help the Aged in Scotland, said predictions of a colder winter and recent increases in the cost of fuel could mean pensioners would face a particularly difficult winter.
She added: "It's important that people take every step they can to avoid becoming casualties of the cold weather.
"The flu virus changes every year and that's why it's crucial to have a flu jab once a year."
The vaccination programme runs in surgeries and medical centres across Scotland.
^ Back to top | BBC Sport Home | BBC Homepage | Contact us | Help | ©
~RS~q~RS~~RS~z~RS~12~RS~)