The Major League Baseball Players Association responded late Thursday afternoon to Major League Baseball’s proposed medical and safety protocols for opening the 2020 season amid the novel coronavirus pandemic, a union official confirmed.

“The union has spent the past several days carefully reviewing the manual and gathering feedback from its medical experts and players across the league, including a 3½-hour video conference with 100-plus player leaders on Monday night,” the official said.

The union’s response to MLB was described as “wide-ranging,” with questions, suggestions and requests for clarification on issues such as testing frequency, protocols for positive tests, the presence of on-site medical personnel, protections for high-risk players and family members, access to pre- and postgame therapies and sanitization protocols.

MLB sent its original proposal, a highly detailed, 67-page manual that covered issues such as testing, social-distancing guidelines and risk mitigation, on Friday.