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The coronavirus vaccine will likely need to be given twice, based on current US testing, CNN writes.
The United States has provided financial support to six pharmaceutical companies to develop the vaccine, two of which, Moderna and Pfizer, are already in the third phase of testing. The third phase comprises a large number of clinical trials. The 30,000 volunteers will receive two doses for each test. Moderna receives a second dose 28 days apart and Pfizer 21 days apart from the first.
By the way, double vaccination is unprecedented in the world of vaccines. Many vaccines, such as hepatitis A or childhood chickenpox, require a double dose.
(Cover image: People are waiting for coronavirus tests in the Dodge Stadium parking lot in Los Angeles on July 1, 2020. The test station is the largest in the country, they can run 6,500 tests a day six days a day. week. Photo: MTI / EPA / David Swanson)
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