Coronavirus cases are spiking among residents and staff at nursing homes and other long-term care facilities. They increased four-fold between May’s end and late October — even as deaths among the vulnerable also doubled, disturbing new data show.

Those are the findings of Rebecca Gorges and Tamara Konetzka, University of Chicago researchers who analyzed federal data at the request of the Associated Press. They focused on 20 states hard hit by the latest pandemic surge.

Konetzka said the data raise major questions about the Trump Administration’s efforts to safeguard the aged, ailing, and injured in institutional care by sheltering them from infections in their surround areas and increasing testing for residents and health workers. But Koentzka, an expert on long-term care, told the AP this about such a plan: