The preliminary and partial results indicate that the vaccine against Covid-19 is safe and induced an immune response even after a single application. The results refer to a part of the participants in phases 1 and 2, which were conducted jointly.
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1,000 volunteers from Curitiba will participate in the third and final phase of Johnson & Johnson vaccine testing – Photo: Reproduction / RPC
Immunization was the fourth to obtain authorization for phase 3 tests in Brazil, in August. Last week, the company announced that it would start the third stage worldwide, with 60,000 volunteers.
In Brazil, according to the National Health Surveillance Agency (Anvisa), there will be 7 thousand participants.
This testing stage will accept participants over the age of 60 and with pre-existing diseases such as diabetes, hypertension, asthma and HIV. The minimum age to participate is 18 years.
If the vaccine’s efficacy and safety are proven, it is expected that it will be available in early 2021 for emergency use, according to the company.
How the 3 phases work
In testing a vaccine – usually divided into phases 1, 2, and 3 – scientists try to identify serious adverse effects and whether the immunization was able to induce an immune response, that is, a response of the body’s defense system.
Phase 1 tests usually involve dozens of volunteers; those in phase 2, hundreds; and phase 3, thousands. These phases are usually conducted separately, but because of the urgency to find a Covid-19 immunization, several companies have performed more than one step at the same time.
What we already know about the Johnson & Jonhson Covid-19 vaccine