Replies(2) Maryland will resume use of the one-shot Johnson & Johnson COVID-19 vaccine. The state saw a 43% drop in new COVID-19 cases last week, the biggest drop in the country, said Gov. Larry Hogan. (Shutterstock) ANNAPOLIS, MD — Maryland's COVID-19 metrics are among the best in the country as the state continues to ramp up coronavirus vaccination efforts, the governor said, with the use of the Johnson & Johnson one-shot vaccine resuming and University of Maryland students facing required vaccinations to return to classes. Gov. Larry Hogan said Saturday the state saw a 43 percent drop in new COVID-19 cases over the last week — the biggest drop in the country.