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Is the first dose of the corona vaccine safe enough? Why is a second dose of the vaccine needed?

Study guide




It has been a few months since the coronavirus vaccination started all over the world, including in our beloved Iran. For many, the question may be why the corona vaccine is given twice, or so-called 2 doses. Is the first dose of the corona vaccine safe enough? Why is a second dose of the vaccine needed? Follow us to the end of the article to answer these questions.

Types of corona vaccines

So far, millions of people around the world have received about one shot of two doses of the Corona vaccine. Vaccines produced around the world have different bases. Some vaccines, such as the Pfizer and Moderna vaccines, are based on mRNA, and some vaccines, such as Johnson & Johnson, are DNA-based or even vaccine-based. Sinofarm are inactivated viruses. As a result, injectable doses, frequency of injections, and efficacy vary.

For example, injecting a single dose of Pfizer and Moderna vaccine is at least 80% effective against the symptoms of Covid 19, while injecting a single dose of Astraznka vaccine is about 70% effective.

The vaccine is legal in the United States and is injected into Pfizer and Astraznka in the United Kingdom. The second dose of the vaccine is given in the UK 12 weeks after the first shot of the vaccine. The second dose of the vaccine is given in the United States 21 days after the first shot of the Pfizer vaccine and 28 days after the first dose of the modern vaccine. In special circumstances, this time interval can reach 6 weeks.

For more information on corona vaccines, read about corona vaccines.

What is the percentage of effectiveness of the vaccine?

The percentage of effectiveness of the vaccine depends on the proportion of people who receive complete protection after receiving the vaccine. For example, when we say that the vaccine is 80% effective, we mean that 80% of people are completely immune and 20% are not completely immune.

  • People who receive complete safety in the first dose, by injecting the second dose, increase the quality of the immune response and its durability.
  • People who do not get complete immunity by injecting the first dose may gain immunity by injecting the second dose. However, some people may not get the second dose because their immune system does not respond to the vaccine.
According to recent studies, a single shot of the vaccine significantly reduces infection and virus transmission; But keep in mind that the effectiveness of the vaccine varies from country to country, and its statistical data should be reviewed in the same country.

Why is a second dose of the vaccine needed?

Corona vaccine injection - Why is a second dose vaccine needed?

New research shows that some vaccines give weak immunity when given in a single dose, but injecting a second dose can have a stronger immune response. In other words, the first dose begins the process of building protection in the body, and the second dose works extensively to strengthen this protection.

For example, suppose you and your friend want to move a table in a room, but your force is such that you can only push the table a little. When your other two friends join you, you can move the table to the desired location. This is what the second dose of the vaccine does.

Studies also show that injecting a second shot of the vaccine is more effective against mutations in the virus. When two doses of Pfizer and Astrazenka were given in the UK instead of one dose, studies showed that the vaccine was more effective against mutations.

In one study, both vaccines were given 3 weeks after the first dose and had a 30% protection against the delta mutation (the Indian mutant species of the corona virus). The rate rose to 60 percent and 88 percent two weeks after the second dose of the vaccine, according to the Secretary of Health, who said the second dose could prevent the spread of delta-type coronavirus in the United States. It is also necessary to inject a second dose of Pfizer vaccine to prevent emerging strains of the coronavirus in the UK.

On the other hand, the injection of the second dose of Pfizer and Astrazenka 3 weeks after the injection of the first dose provided 50% protection against alpha mutation (English mutated species of Corona virus). This rate reached 66 and 93 percent after 2 weeks.

Does the first dose of Corona vaccine provide enough immunity to travel?

The answer is that you will receive the necessary immunity against the virus 2 weeks after receiving the second dose of Corona vaccine. So traveling after the first dose is not an interesting idea, because the first dose creates little safety; But if you have to travel, be sure to observe safety and health issues.

Do’s and don’ts of traveling after the first dose of Corona vaccine

  • Wear a mask and observe social distance.
  • Keep in touch with a small number of people during the trip.
  • Choose a place where more people have been vaccinated.
  • Test for corona 3 to 5 days after the trip.

What happens if you do not get the second dose on time?

According to the Centers for Disease Control and Prevention (CDC), it is best to get a second dose of the vaccine on time. There is still insufficient information on the delay in receiving the second dose and its effect on vaccine immunization.

In many countries, the vaccination process may be disrupted and this delay may occur unintentionally; Otherwise, try to take the second dose on time.

Is there a difference between the first and second dose of the vaccine?

Side effects of both injectable doses of the vaccine are the same, which may include:

  • Injection site reactions including pain, redness and swelling;
  • Fatigue;
  • Fever;
  • لرز;
  • Headache;
  • body pain;
  • Vomit;
  • Swollen lymph nodes.

Symptoms such as fatigue, headache and body aches after receiving the second dose more common Is. These symptoms are usually a sign that your immune system is activated; But it is also normal not to have side effects. The vaccine can also boost your immune system without causing side effects.

Should both the first and second doses of the corona vaccine be the same?

Due to the rise of the coronavirus, in some countries, such as Bahrain and Uruguay, the first dose of Sinofarm vaccine is used and the next dose of Astrazenka is used. On the other hand, the vaccine reduces the risk of transmitting the virus, and injecting the vaccine is far better than not vaccinating. Also, some countries, such as Bahrain and the UAE, use an additional dose of Sinofarm vaccine or a single dose of Pfizer 6 months after the second dose of Sinofarm vaccine to increase the overall support of the vaccine.

However, the Centers for Disease Control and Prevention recommends that you use the same vaccine at both therapeutic doses.

Final points

Because no vaccine is 100% effective and different mutations can reduce the support and effectiveness of the vaccine, new cases of coronary heart disease may be reported after complete vaccination. The immune system also needs several weeks to fully grow.

Some people develop coronary heart disease immediately after the second dose The severity of the disease is milder in vaccinated people than in others. On the other hand The vaccine reduces the rate of virus transmission. Vaccines help to prevent coronary heart disease; So the restrictions do not mean that the vaccine solution will fail.

You say

What do you think about using the vaccine? ‌ Do you get the vaccine and recommend it to others? If you wish, you can share your opinion with us in the comments section and send this article to your friends through social networks.

Other sources: fortune And ucsf And sputnikvaccine And theconversation And healthline And curlytales

Warning! This article is for educational purposes only and you should consult your doctor or specialist to use it. more information

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