These vaccine trial participants in an Indian city said they didn't know they were being tested on
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More than a dozen slum residents in Bhopal, India, say they thought they were being vaccinated for Covid-19. They say they later discovered from local activists that some of them hadn't been given an approved vaccine and had unwittingly taken part in a Phase 3 clinical trial for India's homegrown vaccine, Covaxin. CNN's Vedika Sud reports.