At Least 7 USNS Mercy Crew Members Test Positive For Coronavirus

The USNS Mercy, a Navy hospital ship docked in Los Angeles, has reported seven sailors testing positive for COVID-19. These sailors are isolated, and the ship's operations remain unaffected. Initially deployed from San Diego to assist local hospitals by treating non-COVID patients, the ship also prioritizes healthy seniors from infected nursing homes. Staffed by Navy medical personnel and civil service employees, the ship continues its mission. Meanwhile, a COVID-19 case has been reported on the USNS Comfort in New York City, with the individual isolated on board.

What was the purpose of prioritizing healthy senior citizens on board the USNS Mercy?

What is the capacity of the USNS Mercy in terms of beds?