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Recently, the Danish National Serum Institute (SSI) pointed out that after the first dose of AstraZeneca's new crown vaccine, the second dose of Pfizer/BNT or Moderna's mRNA vaccine can produce "good protection.
More and more countries are considering switching to a different COVID-19 vaccine for the second vaccination.
After the first dose of the AZ vaccine, and the second dose of Pfizer or Modena vaccine, there are more than 144,000 Danish nationals, most of whom are first-line medical personnel and the elderly
Infect
The European drug regulatory agency did not recommend the timing of mixing the new crown vaccine with the doses of different manufacturers in July, saying that it is too early to confirm whether and when additional booster injections are needed
EMA does not make clear recommendations for changing the dose, but recommends that countries consider these situations
At the same time, the World Health Organization (WHO) has previously warned individuals not to mix different doses of COVID-19 vaccine, saying that the decision should be made by health authorities
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