why isn't brock purdy playing today

Brock Purdy is not playing today due to a recurring toe injury that he originally sustained in Week 1 of the NFL season. He missed Weeks 2 and 3 because of this turf toe injury and then returned in Week 4. However, he experienced soreness and an aggravation of the same toe injury during the Week 4 game against the Jaguars, leading to him being ruled out for today's game against the Los Angeles Rams. He is considered week-to-week with no specific timeline for his return, and there is a possibility he could miss additional games beyond today. In his absence, backup quarterback Mac Jones is starting for the 49ers.