FRIDAY NIGHT: Whit Johnson joins David Muir as Johnson & Johnson releases results on their single-shot vaccine, saying it’s 66% effective in preventing symptomatic cases, but 100% effective in preventing hospitalizations as deaths, as the country’s current vaccine rollout continues to see setbacks; Dr. Jha takes a closer look at the efficacy of Johnson & Johnson’s vaccine and how health officials are tracking these new COVID variants in the U.S. https://abcn.ws/3p5x61W | ABC World News Tonight w

THURSDAY NIGHT: Whit Johnson joins David Muir as the country records the deadliest day since the pandemic began, with nearly 200,000 new cases in just 24 hours and California preparing for potential lockdowns as new wildfires explode; Gio Benitez the latest on Pfizer’s new COVID-19 vaccine, with a new report saying the company wanted a larger rollout but had problems with the supply chain, but says it will not effect doses expected in the U.S. by the end of the year. https://abcn.ws/3lrGmuA | AB

VACCINATION PAUSE: Two sites in North Carolina and one in Colorado paused vaccinations after reports of a small number of adverse reactions to the Johnson & Johnson shot, as the company faces another hurdle with its vaccine rollout. Whit Johnson reports. https://abcn.ws/3uAFadj | ABC World News Tonight with David Muir