The CDC still needs to sign off before booster shots of the Moderna and Johnson and Johnson vaccines become available.

<p>The CDC still needs to sign off before booster shots of the Moderna and Johnson and Johnson vaccines become available.</p>

Get the latest news, sports, entertainment, money and tech stories from USA TODAY through your voice assistant.

<p>Get the latest news, sports, entertainment, money and tech stories from USA TODAY through your voice assistant.</p>