It comes as the annual flu jab campaign was launched at a health centre in Cardiff.
BBC: Flu jab given at some pharmacies in Wales for first time
Last year, all children between six months and five years were offered the pandemic H1N1 swine flu jab.
There are things you can do to minimise some risks such as have a flu jab, stay warm and wash your hands regularly.
In a contrast to U.S. policy, the World Health Organization recommends only six "priority populations" get "the flu jab, " as it's called in Britain.
His comments come as doctors' leaders objected to pharmacies in Rhondda Cynon Taf and Blaenau Gwent trialling a system to offer the flu jab this winter.
One upward trend is in the number of pregnant women receiving the flu jab this year - around 25%, compared to 13.6% by this week in 2011.
In the UK, only people aged over 65 or in at-risk categories are advised to get a flu jab, with take-up in the elderly category averaging between 72% and 75%.
Everyone over 65 is eligible to receive a flu jab, as well as people with certain chronic medical conditions such as asthma and diabetes which can render them vulnerable to chest infections.
GPs had been encouraged to stockpile the winter flu jab at their own cost and risked being undermined if pharmacies, which did not have to buy the vaccination, were also able to offer it, he said.
Up until a couple of years ago there were no vaccines routinely offered to pregnant women in the UK. The swine flu pandemic changed that, and now all pregnant women are offered a seasonal flu jab.
Chair of the National Flu and Pneumococcal Group, Dr Jim McMenamin, warned about the potential consequences of not getting the jab.
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