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In a clinical trial involving about 300 people, the most common side effects after the Pfizer booster dose included: Pain, redness and swelling at the injection site. Fatigue.
The updated Covid vaccines should be more accessible, experts say. Saturday 16 September 2023 21:00, Maggie O’Neill. The cost of the new Covid vaccines may prohibit some people from getting them ...
COVID-19 increases the risk of heart attack and stroke years after infection, a new study finds. Here, experts explain COVID and cardiovascular health.
The thrombosis events associated with the COVID‑19 vaccine may occur 4–28 days after its administration and mainly affects women under 55. [6] [2] [20] Several relatively unusual types of thrombosis were specifically reported to be occurring in those with the reaction: cerebral venous sinus thrombosis and thrombosis of the splanchnic veins.
In August 2022, the "Pfizer-BioNTech COVID-19 Vaccine, Bivalent (Original and Omicron BA.4/BA.5)" (in short: "COVID-19 Vaccine, Bivalent") received an emergency use authorization from the US Food and Drug Administration (FDA) for use as a booster dose in individuals aged twelve years of age and older.
Booster shots can also be used after infections. In this regard, the UK's National Health Service recommends people to wait 28 days after testing positive for COVID-19 before getting their booster shots. Evidence shows that getting a vaccine after recovery from a COVID-19 infection provides added protection to the immune system. [28]
For some, COVID-19 symptoms may persist weeks to months after the initial infection. In 2022, 6.9% of US adults reported to have experienced long COVID, according to a CDC survey .
It suggests that personalization of the vaccine dose (regular dose to the elderly, reduced dose to the healthy young, [359] additional booster dose to the immunosuppressed [360]) might allow accelerating vaccination campaigns in settings of limited supplies, thereby shortening the pandemic, as predicted by pandemic modeling.