NJ-based Johnson & Johnson says COVID-19 vaccine is safe, showing promising immune response

Johnson & Johnson says its COVID-19 vaccine is safe and showing a promising immune response.
The company has reported few side effects in early trials, things such as headache, muscle aches, and soreness.
Data shows most volunteers developed antibodies after 28 days.
Johnson & Johnson's vaccine requires only one dose, while Pfizer's and Moderna's require two.