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The biotechnology company Novavax will soon begin the second phase of human testing for its COVID-19 vaccine.

The so-called phase 2b clinical trial will include a group of 2,665 healthy adults in South Africa, as well as a group of 240 adults with HIV who are considered medically stable but whose immune responses may differ from individuals without HIV, according to a statement released by Novavax on Aug. 17. HIV advocacy groups have pushed for people with HIV to be included in clinical trials for COVID-19 vaccines, as companies like Moderna and Pfizer initially said they would exclude volunteers with the infection, Science Magazine reported.