A UK examines estimated {that a} single dose of both Pfizer or AstraZeneca’s vaccine was between 56% and 62% efficient at stopping COVID-19 an infection brought on by the Alpha variant in folks over 75 years old, 4 to seven weeks after the primary dose. Globally, Pfizer expects to have the ability to produce as much as 50 million vaccine doses in 2020 and 1.3 billion doses by the tip of 2021. Questions have been raised over the vaccine’s storage, which requires ultra-cold freezers set at minus 70 levels Celsius (-94 levels F).
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Many have reported experiencing unintended effects, like fatigue, chills, or muscle aches after receiving a COVID-19 vaccination, however, others might expertise no signs or simply really feel arm ache. Recipients might name their healthcare supplier and report that they’re experiencing signs comparable to ache, swelling on the injection website, tiredness, headache, fever, and/or chills. Primarily based on the info, an excessive share of sufferers who obtained the Pfizer, Moderna, or Johnson & Johnson vaccine reported ache on the injection website.