Typically the flu season spikes in the winter months of January and February. Yet, that does not mean it is a good idea to put off getting your flu shot until then. An estimated 180 million doses of the flu vaccine have been produced this year, protecting against three of the four strains of the flu the Centers for Disease Control and Prevention (CDC) predicts will be the most prevalent. That may sound like a lot flu shots and nasal sprays, but supplies may run low towards the end of the flu season.