Although MERS is more deadly than SARS-CoV-2, it looks it's less transmissible between people than SARS-CoV-2. I heard an epidemiologist theorize that it might be because people infected with SARS-CoV-2 shed the virus before they show any signs of COVID.
Maybe that's why MERS never spread widely outside of areas where camels don't exist widely.
Maybe that's why MERS never spread widely outside of areas where camels don't exist widely.