Many people have recently been vaccinated, but many people have reported that they don’t feel anything after the first shot, but the side reactions after the second shot are very severe, and they all said that “the momentum is really big”, “very high” and “the experience is very special.”
Why does the second shot of the new coronavirus vaccine feel so great?
- Experts said that after the second injection of COVID-19 vaccine, the side effects are stronger than the first injection.
- Side effects include fatigue, arm soreness and fever.
- Experts point out that these side effects are usually mild and disappear 48 hours after vaccination.
Some people who have been vaccinated with COVID-19 reported that they felt fine after the first vaccination, but after the second injection, they would have symptoms such as fever, fatigue, headache and soreness in the injection site of their arms.
This is actually a good thing in most cases, and these common symptoms are usually signs that the vaccine triggers an immune system response.
When you feel sick or have a fever, it's mainly your body that's responding."
Millions of doses, there's almost no problem
so far, according to data from the U.S. Centers for Disease Control and Prevention (CDC), the U.S. has been injected with more than 55 million doses of COVID-19 vaccine so far.
About 15 million people have received the second dose.
Americans (28 million people) have received vaccines developed by Pfizer BioNTech, slightly more than Moderna (26 million people).
Both vaccines are mRNA vaccines, which activate the immune system by allowing the immune system to recognize a protein that causes COVID-19 found in the virus.
Powell said: "The first vaccine teaches your body how to respond to the virus." With antibodies and memory cells, the immune system's response is often stronger during the second injection, so the second response usually comes from the immune response produced by the memory cells.
Side effects were expected
When applying for emergency use authorization from the U.S. Food and Drug Administration (FDA), both Pfizer and Moderna disclosed the side effects experienced by participants during the vaccine clinical trial. The practical experience of the
vaccine seems to reflect the researchers' observations well.
First of all, side effects are often more common after the second injection of the vaccine.
, Dr. Sharon Nachman, director of the Department of Pediatric Infectious Diseases at Stony Brook Children's Hospital in New York, said: "Generally speaking, the second dose is more common, where fatigue and local reactions are more common than fever."
The minor side effects of getting the COVID-19 vaccine tend to disappear within 48 hours of injection. Severe side effects, such as allergic reactions, are rare. In addition, side effects are usually more obvious in young people than in older people, probably because their immune system is stronger.
According to the study data submitted to the FDA, 7% of people who received the first dose of the Pfizer vaccine between the ages of 18 and 55 reported fever, while 31% reported fever after receiving the second dose.
No matter what side effects there are, the vaccine is effective
Although some people are worried about the side effects, Powell stressed that if you don’t feel uncomfortable after the first or second shot, you shouldn’t worry because for most people, it’s very mild and some people feel nothing.
She pointed out that side effects vary from person to person, and no symptoms does not mean that your immune system is not working properly.
Powell also stressed that fear of side effects should not hinder people from full vaccination. Although the first dose of the vaccine can increase your immunity by about 50%, the vaccine's protection rate for symptomatic COVID-19 has only risen to 95% about 2 weeks after the second injection.
So although the second needle is a bit over the top, it is essential.
