Flu season has arrived – and so have updated flu vaccines

The flu vaccine is updated every year to include the strains known to be circulating. Cecilie_Arcurs/E+ via Getty Images

As the autumn’s cool weather settles in, so does flu season – bringing with it the familiar experiences of sniffles, fever and cough.

Every year, influenza – the flu – affects millions of people. Most will experience the infection as a mild to moderate illness – but for some, it can be severe, potentially resulting in hospitalization and even death.