If you haven't gotten your flu shot yet, there's still time!
That being said, the CDC has issued an advisory noting that one of the strains has mutated. This will lessen the effectiveness of the vaccine (not, as some have claimed, make the vaccine useless). It's likely that even with the strain having mutated the vaccine can help lessen symptoms.
Here are some helpful links:
Official CDC Health Advisory
No the CDC did not just apologize... (Orac does a fantastic job debunking all the social media misinformation)
Nurses Who Vaccinate: CDC Health Advisory
- CDC Health Advisory