Pfizer vaccine side effect after first dose12/30/2023 Rigorous studies where we compare the number of myocarditis cases in vaccinated and unvaccinated populations are underway in countries such as Israel, the United Kingdom and the United States to assess whether there is any link between myocarditis and the Pfizer vaccine.īut at this stage, there’s no significant cause for concern. They have noted that in most of the reported cases, the people have recovered.Īustralia’s Therapeutic Goods Administration, meanwhile, is continuing to monitor myocarditis and pericarditis as “adverse events of special interest”. The COVID-19 subcommittee of the WHO Global Advisory Committee on Vaccine Safety is also reviewing this issue. How do we know the COVID vaccine won't have long-term side-effects? These include infections, particularly from viruses or bacteria or damage to the heart’s tissue or muscle as a result of autoimmune diseases, medicines, environmental factors, or other triggers, including, rarely, vaccines. It’s important to note heart inflammation can be caused by many factors. However, no causal link has been formally established. The US Centres for Disease Control notes these cases have been mostly in younger males (aged 16 years and older), usually appear within several days of vaccination, and are more common after the second dose. Recently there have been reports from overseas, including the United States and Israel, of myocarditis (heart inflammation) and pericarditis (inflammation of the lining of the heart) following vaccination with the Pfizer vaccine. Mick Tsikas/AAP Myocarditis and pericarditis On very rare occasions - about five in one million doses - someone will have an anaphylactic reaction after receiving the Pfizer vaccine. You may be referred for a specialist allergy consultation. If you happen to have had an acute allergic reaction after vaccination, it’s important you tell your doctor before getting a second dose of the same vaccine. Anaphylaxis nearly always happens in the first 15 minutes to half hour after vaccination, which is why people are asked to wait in the clinic after receiving a COVID-19 vaccine.Īnaphylaxis is easily treated (reversed) with an injection of adrenaline by nursing and medical staff at the vaccination centres, and people affected generally make a complete recovery. Overall it’s estimated anaphylaxis occurs in approximately five people per million doses of the Pfizer vaccine administered. Anaphylaxis is an acute allergic reaction where people experience a rash, lip and tongue swelling, trouble breathing and sometimes shock (low blood pressure and fast heart rate). There have been reports of anaphylaxis after the Pfizer vaccine. We're gathering data on COVID vaccine side effects in real time. But if your symptoms persist or get worse, you should see your GP. You can manage symptoms such as pain or fever with medicines like paracetamol or ibuprofen. We know from AusVaxSafety surveillance and safety data from overseas they usually last less than two to three days, and nearly everyone who experiences side effects is back to normal one week after vaccination. Side effects will usually present in the first 24-48 hours after vaccination. They occur because our immune system is responding to the vaccine. These sorts of side effects are very similar to those reported in clinical trials and what’s been set out in the Pfizer vaccine’s product information. The most common side effects include headache, muscle aches and fatigue, and these are more common after dose two compared to dose one. We know a lot about its safety from both clinical trials and safety surveillance programs in the community.ĪusVaxSafety has been collecting and regularly updating vaccine safety data from Australians who have received a COVID vaccine, either Pfizer or AstraZeneca.Īs of May 30, more than 245,000 people had responded to text message or email questionnaires on side effects after their first dose of the Pfizer vaccine, and over 140,000 people had responded after dose two.Ĭlose to two-thirds of people reported no reactions after the first dose, and 40% reported no reactions after the second. This vaccine has now been administered to many millions of people around the world. Two doses are needed, with a gap of at least three weeks between doses. In Australia the Pfizer vaccine is registered for use in people over 16. We’re monitoring the safety of the Pfizer vaccine in real time
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