difference. cecilia, thank you. now to the pandemic. a new study on mixing and matching vaccines coming on the eve of a key fda meeting on booster shots. preliminary findings indicating that getting a booster different from your original vaccination is likely safe and effectve. and up next for that panel, pfizer's vaccine for 5 to 11-year-olds. the white house telling governors to get ready to vaccinate kids in that age group early next mounth. and the u.s. working vaccinated travelers next month, one more sign that we may be turning the corner. here's stephanie ramos. >> reporter: tonight, preliminary results from a highly anticipated study finding that when it comes to boosters, mixing and matching vaccines is likely safe and effective. the study from the national institutes of health looking at moderna, pfizer, and johnson &