"We have no direct correlation between how many symptoms someone gets and the strength of the body's immune response," Dr Cheng said. While being stuck in bed for a day with a headache and fever is a sign that the vaccine is doing its job to trigger an immune response from your body, not experiencing any symptoms doesn't mean the opposite, Dr Quinn said. Are side effects a sign of a strong immune system? "That's why we see after two to four days, some of the systemic reactions start to wear off," he said.
The downside of this immune activity is that it can also trigger systemic reactions such as fever, lethargy, and body aches and pains.īut thankfully, these symptoms fade once the body has produced enough antibodies, Dr Cheng said. "The symptoms actually represent the body's preparation to fight." The body then recognises those spike proteins as foreign, and produces antibodies that can fight a real virus infection down the track. When this piece of genetic material, called mRNA, enters human cells during the vaccination process, those cells "read" it like a blueprint and start making the virus's spike protein.
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Instead, they train your body to fight against the virus.įor instance, the Pfizer vaccine uses a small piece of the SARS-CoV-2 genetic code that's involved in building the virus's spike protein, used by the virus to latch onto and enter human cells. While fever, headaches, and lethargy can make you want to call in sick, it's important to remember that vaccines don't infect you with COVID-19. "The risk of getting myocarditis from COVID-19 is significantly higher than getting it from the vaccine," said Daryl Cheng, a clinical informatician and paediatrician who specialises in immunisation at the Royal Children's Hospital.Ĭatch up on the latest COVID-19 news here Am I getting sick from the vaccine? This was out of approximately 3.2 million doses of Pfizer and most cases had recovered or were recovering, according to the TGA. ( ABC News)Īs of 4 July, the TGA received 38 reports of suspected myocarditis or pericarditis 13 of these were men and 25 were women.
Pericarditis is inflammation of the thin membrane that surrounds the heart. Symptoms of these conditions include chest pain, shortness of breath and palpitations, but these are usually mild. There have also been rare reports of heart inflammation (myocarditis) or inflammation of the heart membrane (pericarditis) after the second dose of Pfizer, though a causal link has not been established. "Sometimes it happens after the first dose of AstraZeneca, whereas with Pfizer it seems to happen more often after the second dose," Dr Quinn said. These side effects can also occur after the AstraZeneca vaccine, but they tend to show up at different times, said Kylie Quinn, a vaccine expert at RMIT University. These symptoms are in line with those seen in clinical trials and are often experienced with other vaccines, according to the Therapeutic Goods Administration (TGA). The most common symptoms were fatigue, pain at the injection site and headaches, with around 22 per cent reporting that they missed work, study or routine duties for a day. How common are post-Pfizer side effects?ĭata from AusVaxSafety, Australia's national vaccine safety system, suggest that Ms McGuire is not alone.Ī survey of 314,192 people who had received two doses of Pfizer found that 57.5 per cent of respondents had experienced adverse effects within three days after the second jab.
"I didn't feel great at the time, but I knew it was perfectly fine and felt reassured that obviously something was working."īut why do these side effects happen in the first place and is there anything you can do to avoid them?
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