Emily Harris, JAMA. Published online November 1, 2023. doi:10.1001/jama.2023.21170 A study linking viral infection with reduced levels of serotonin, a neurotransmitter involved in learning, memory, and mood, has proposed a new potential mechanism underlying post–COVID-19 condition. Also known as long COVID, the condition involves symptoms such as fatigue, memory loss, and cognitive impairment. Using results from human participants, […]