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If you are fully vaccinated in the US, adding an extra COVID vaccine won’t do any harm, but it won’t help either. New research shows that mixing the Astra Zeneca and Pfizer vaccines is safe and effective. “AstraZeneca has never been studied as a single dose,” said Dr. Monica Gandhi, Deputy Head of Department at UCSF / San Francisco General Hospital. Gandhi, a leader in infectious diseases, reminds us that the AstraZeneca vaccine, intended as a two-dose vaccine, is not approved in the United States. “It should always be refreshed for six, eight, 12 weeks. It depends on what each country decides,” she told Newsy. Johnson’s and Johnson’s vaccine uses the same technology as AZ, but they have been studied and shown to work as a single-dose, single dose. “Well, it’s not researched, so I would say we don’t have data to inform, inform, and say we believe the J&J will actually do well. We don’t have a lot of data to do, too.” say how well you are protected by a second vaccine, said Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention on the Today Show. The National Institutes of Health have just started recruiting people for an early phase 1 clinical / 2 study to look at booster doses of various COVID-19 vaccines and how “mixing” these vaccines together works – such as someone who has been fully J&J vaccinated and is given a Moderna booster. The CDC does not recommend additional doses Of vaccines, CVS and Walgreens tell Newsy they are going with CDC guidance for the time being too. The other part that you should keep in mind are breakthrough infections – it’s rare after one he vaccinated to contract COVID. To date, of the more than 150 million Americans fully vaccinated, 4,115 have contracted a breakthrough infection. The CDC says that number is likely under counted, but overall this is still a rarity. “There is no evidence that we have more breakthrough infections in this country from the Johnson and Johnson dose than from the MRNA vaccines,” said Gandhi. “This is scary,” said Dan Richard in a video he posted on Facebook of the case for Richard of Aurora, Colorado. He has just returned home from COVID-ICU. He had been fully vaccinated earlier this year – with a Pfizer MRNA vaccine. “Wear a mask, get vaccinated. Wear a mask after you’ve been vaccinated,” he said. Bottom line: Experts say it comes down to personal choice when someone wants an extra dose, but the science behind it? We do not know yet.