In-depth information on the second dose timeline for Covid19 vaccine

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Ngày cập nhật gần nhất: 15/4/2026

Content

1. Various types of Covid19 vaccines approved for use in Vietnam by the Ministry of Health

AstraZeneca Vaccine

Gam-COVID-Vac Vaccine (also known as SPUTNIK V)

Sinopharm's Vero Cell Vaccine

Pfizer/BioNTech's Comirnaty Vaccine

Moderna's Spikevax Vaccine

Janssen Vaccine

2. Second Dose Timing for Various Covid-19 Vaccines

3. Exceeding the recommended interval for the second dose of Covid19 vaccines: Do you need to start over?

4. Is the second dose of Covid19 vaccine required to be the same as the first dose?

Timeline for the second dose of Covid19 vaccine

1. Various types of Covid19 vaccines approved for use in Vietnam by the Ministry of Health

Timeline for the second dose of Covid19 vaccine

AstraZeneca Vaccine

Second Dose Timing for AstraZeneca

AstraZeneca vaccine is currently the most widely used in Vietnam. @tuoitre

Gam-COVID-Vac Vaccine (also known as SPUTNIK V)

Gam-COVID-Vac, developed by the Gamaleya Research Institute in Russia, has been authorized for use in 70 countries and territories. Currently, it is in operation in 49 countries and territories, including Vietnam.

Sinopharm's Vero Cell Vaccine

Sinopharm's Vero Cell vaccine, developed in collaboration with the Beijing Institute of Biological Products Co., Ltd., China, has been granted approval for usage in 64 countries and territories. It is actively being used in 59 countries, including Vietnam.

Pfizer/BioNTech's Comirnaty Vaccine

This vaccine has been authorized for use in 111 countries and territories. Currently, it is actively employed in 97 countries, including Vietnam.

Moderna's Spikevax Vaccine

Manufactured by Moderna, this vaccine has received approval for usage in 64 countries and territories. Presently, it is in use in 63 countries around the globe.

Janssen Vaccine

Janssen Vaccine, produced by Janssen Pharmaceutica NV (Belgium) and Janssen Biologics B.V (Netherlands), has been granted usage approval in 56 countries and territories. To date, it has been utilized in 34 countries. Although approved by the Ministry of Health, Vietnam has not yet received this vaccine.

2. Second Dose Timing for Various Covid-19 Vaccines

timing for the second dose of Covid-19 vaccines

Timing for the second dose of Covid-19 vaccines. @legalibrary

AstraZeneca Vaccine: First dose spaced 8 - 12 weeks apart from the second dose.Gam-COVID-Vac (also known as SPUTNIK V) Vaccine: First dose spaced 3 weeks apart from the second dose.Comirnaty - Pfizer Vaccine: First dose spaced 3 weeks apart from the second dose.Sinopharm's Vero Cell Vaccine: First dose spaced 3 - 4 weeks apart from the second dose.Moderna Vaccine: First dose spaced 4 weeks apart from the second dose.

It is recommended for individuals to receive the second dose within the timeframe provided by the Ministry of Health. @thanhnien

3. Exceeding the recommended interval for the second dose of Covid19 vaccines: Do you need to start over?

timing for the second dose of Covid19 vaccines

4. Is the second dose of Covid19 vaccine required to be the same as the first dose?

According to the Ministry of Health, in cases where the vaccine supply is limited, a combination of different vaccines can be considered as follows:

Individuals who received the first dose of AstraZeneca can opt for the second dose of Pfizer/BioNtech with the consent of the vaccinated person (interval between doses is 8 - 12 weeks).Those who received the first dose of Sinopharm-manufactured vaccine should only take the second dose of the same vaccine.Individuals who received the first dose of Moderna vaccine can opt for the second dose of Pfizer, and vice versa.

The practice of combining two types of vaccines has been adopted by many countries. @vtv.vn

Recent studies from several countries have shown that administering the second dose of Pfizer/BioNtech to those who received the first dose of AstraZeneca may elicit a robust immune response. The antibody levels produced are equivalent to receiving two doses of Pfizer vaccine or stronger than receiving two doses of AstraZeneca.

timing for the second dose of Covid19 vaccines

Reference: Ministry of Health

Explore more:

Things to know about Covid vaccine policies in VietnamPrecautions before and after receiving the Covid19 vaccineComprehensive guide to staying safe during Covid testing

Frequently Asked Questions

What is the recommended timing for the second dose of the AstraZeneca vaccine?

The AstraZeneca vaccine's second dose should be administered 8 to 12 weeks after the first dose, following the guidelines provided by the Ministry of Health in Vietnam.

Can I mix different Covid-19 vaccines for my second dose?

Yes, in cases of limited vaccine supply, individuals can mix vaccines. For instance, those who received AstraZeneca can opt for Pfizer/BioNTech for their second dose after 8 to 12 weeks.

Is the second dose of Covid-19 vaccine mandatory to be the same brand as the first?

No, it is not mandatory. For instance, individuals can receive a different vaccine for the second dose, such as switching from AstraZeneca to Pfizer/BioNTech if approved.

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