Experts caution COVID-19 tests don’t guarantee safe Thanksgiving

Millions, including college students traveling home, are scrambling to get tested before Thanksgiving. The CDC issued an urgent warning against traveling for the holiday.
2:51 | 11/20/20

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Transcript for Experts caution COVID-19 tests don’t guarantee safe Thanksgiving
You heard that urgent plea from the CDC to stay home, not to travel this Thanksgiving. Authorities are now warning those negative tests are not a pass to do what you would like. They're urging caution with all these test results. Here's Tom llamas in Boston Reporter: Tonight as families debate how to spend Thanksgiving, millions are rushing to get tested. And now the CDC with that warning strongly urging Americans not to travel for the holiday and only celebrate with people in their own households. I think I'll get a test before I leave just so I don't put my family in danger. Reporter: But experts caution testing could provide a false sense of security. A single negative test is not a pass to say I am fine, I can now go do whatever I want. You could still be infected and incubating. You can't test your way into Reporter: Boston's mayor telling students if they go home, stay there. If they do go home for the holidays, if meaning out of state, we're asking them not to come back, if they could just do the rest of the semester online. Reporter: At Boston university, they're recommending students not go home at all. In a perfect world, you'd want students to celebrate Thanksgiving right her campus. Absolutely. We're encouraging all of our students to stay here on campus. We know that travel increases risk of viral transmission. Reporter: Sophomore Amanda Buettner is one of those students staying on campus. I didn't want to go back there and bring it back to Boston. Reporter: One doctor say think about your people. Some people have said gather at Thanksgiving and regather for your funeral for new years day. That is a bleak way to put it, but at this point, we really have to be honest. Reporter: Governors from multiple states with a new psa. Mask up, Illinois. Mask up, Ohio. Mask up, Indiana. Reporter: Those same governors now pleading with Americans to avoid big family gatherings, writing in a new op-ed, "As hard as it will be to not see them this Thanksgiving, imagine how much harder it would be if their chairs are empty next year." Let's get right to Tom tonight at a testing site at Logan international airport. Tonight, you're learning there's some new proof that Americans may be heeding that advice not to travel. Reporter: That's right, David. United, an and southwest reporting spikes in cancellations. As you mentioned, we are seeing a new trend at the airports because some people still have to travel. Pilots still hav to work. There are testing centers at the airport offering rapid tests. Just like other sites, they tend to run out. Tom, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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