What's the difference between flu jabs this season?

Flu season has hit the northern hemisphere hard - with many countries experiencing their highest case numbers in years. Many will be lining up at workplaces or doctors offices to get the annual flu vaccine to avoid becoming one of those numbers here - but there's more than one jab on offer - with some practices offering so called 'advanced' flu vaccines. Immunisation Advisory Centre medical adviser, Dr Edwin Reynolds spoke to Lisa Owen.