Miriam Strout was a Healer on the Janus Thickey Ward at St Mungo's Hospital for Magical Maladies and Injuries. She was described to be a motherly-looking healer.
Strout was responsible for looking after long-term patients such as Agnes, Gilderoy Lockhart, and Alice and Frank Longbottom. When Harry Potter, Hermione Granger, Ron and Ginny Weasley came up to the Janus Thickey Ward by accident, she led them in, mistaking them wanting to visit Lockhart, who had managed to sneak out of his room for a while.
She was also looking after Broderick Bode when he was killed by a Devil's Snare plant sent to him by Death Eaters. Although St Mungo's has strict regulations of the gifts allowed into the hospital, Strout mistook the Devil Snare to be a harmless Flitterbloom, and thought the improving Bode could take care of it, a mistake which cost him his life. She was suspended on full pay whilst the matter was investigated, and was unavailable for comments for the Daily Prophet.