A Chinese couple, both diagnosed with the rare Bickerstaff brainstem encephalitis, have tragically lost their newborn child. They are one of only a few couples globally diagnosed with this condition simultaneously.

A young Chinese couple who were both diagnosed with a rare autoimmune disorder a year after getting married have lost their newborn baby. The couple in northern China’s Tianjin municipality were diagnosed with Bickerstaff brainstem encephalitis last year. The husband, surnamed Li, said only four couples in the world had been diagnosed with the disorder at the same time, and they were the first case in China. Li, 32, had a fever last March, a year after he married his wife. He also felt...