Vaccinations offer America hope of curbing the pandemic, but rates aren't where they need to be. Now is the time to be cautious, Dr. Vivek Murthy says.

Although vaccinations have offered many in the US hope of curbing the Covid-19 pandemic, officials are struggling to get rates where they need to be. And having been tricked by the virus before, the US Surgeon General says now is the time to be cautious.

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