Does the vaccine work even if there is no fever after the first or second dose? – Corriere.it

of Cristina Marrone

Not everyone reacts to immunization in the same way. Older people are less sensitive to side effects than women and younger people. Arm pain is the local inflammatory reaction

1 Is the Covid-19 vaccine less effective if no side effects occur?
Post vaccine side effects such as fever, headache, injection site pain, muscle and joint pain, nausea and vomiting they are directly linked to the immune response to the vaccine. The belief has been erroneously held that the sicker you feel after the injection, the more effective the vaccine is. Although the side effects are proof that the immune system is activating, by no means said that everyone is sick once they receive the vaccine. It is possible to have an effective immune response without noticeable side effects.

2 Why doesn’t everyone react the same way?
Immune responses can vary and be influenced by age, gender, health status and even the dose you are receiving (more frequent after the second dose in mRNA vaccines and after the first dose of AstraZeneca). Each person exhibits a different immune response, but the effectiveness of vaccines does not depend on them. In the clinical study of the Pfizer vaccine it was found that it was 95% effective against the disease in those who received it, regardless of age, sex, ethnicity. However, only half of the volunteers reported adverse reactions such as muscle pain, fatigue, fever.

3 On whom are the side effects greatest?
Overall the older population reports fewer side effects than younger people and women tend to develop stronger immune responses than men.

4 Why does your arm hurt?
When the vaccine is injected into the arm, the body considers it a threat and sets up defenses. The first one local inflammatory reaction and why you may feel pain or swelling. Sometimes arm pain is associated with swelling of the arms lymph nodes in the armpit area.

5 Should we worry about fever?
The inflammation may go beyond the arm, site of the injection, and spread to other parts of the body, causing a rise in temperature and widespread pain in the first place. The onset of fever confirms that the body is developing its immune defenses against the virus. The temperature usually begins to rise within twenty-four hours of vaccination, more rarely after forty-eight and generally lasts no more than two days.

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6 Can you test positive for the swab after vaccination?
Since the vaccines do not contain coronaviruses, it is not possible to contract Covid-19 or test positive for the swab due to immunization. Vaccines contain or, in the case of mRNA vaccines, induce the production of very small parts of the virus, which however are not detected by tests. Furthermore, the immune response induced by vaccination is localized to the arm. No component of the vaccine can migrate from the arm to the nose or throat (where the swab is taken).

July 20, 2021 (change July 20, 2021 | 15:07)

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