Monica Melkonian wanted the Johnson & Johnson Covid vaccine. It was only one shot and then she would be protected against the virus. So she was thrilled when the vaccination clinic at the Deschutes County Fair & Expo Center on April 7 had her first choice.

But on April 13, Melkonian started experiencing headaches, a sharp pain behind her left eye. That same day federal health officials announced a pause in the use of the J&J vaccine after learning that six people had developed a rare blood-clotting disorder following their shots.