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Six-month follow-up of a booster dose of CoronaVac in two single-centre phase 2 clinical trials | Nature Communications
Healthy Canadians - Second dose appointment coming up? mRNA vaccines, like Pfizer and Moderna, can be used interchangeably, meaning either can be used as a second dose. The Pfizer and Moderna vaccines
![COVID-19 Vaccine Second-Dose Completion and Interval Between First and Second Doses Among Vaccinated Persons — United States, December 14, 2020−February 14, 2021 | MMWR COVID-19 Vaccine Second-Dose Completion and Interval Between First and Second Doses Among Vaccinated Persons — United States, December 14, 2020−February 14, 2021 | MMWR](https://www.cdc.gov/mmwr/volumes/70/wr/social-media/mm7011e2_COVID19VaccineDose2_IMAGE_12Mar21_v4_1200x675.jpg)
COVID-19 Vaccine Second-Dose Completion and Interval Between First and Second Doses Among Vaccinated Persons — United States, December 14, 2020−February 14, 2021 | MMWR
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