the headquarters of the School. In 1927, the organisation became the Mothers' and Babies' Health Association (MBHA), and by 1932, it had branches throughout South Australia. Mayo's colleagues during this period included Dr. Marie Brown (1883–1949). Mayo served as the honorary medical officer of the association until her death in 1967, by which time the organisation gained a training school for maternal nurses and a hospital. In her honour, the Association inaugurated the annual Helen Mayo lecture. Eventually, in 1981, the Mothers' and Babies' Health Association was incorporated into the Department of Health of the South Australian Government. After visiting Melbourne to learn how to make vaccines, in 1911 Mayo was appointed clinical bacteriologist at the Adelaide Hospital, a position she would hold for 22 years. Mareeba Hospital In the early part of the 1910s, there was an urgent need for medical facilities to treat infants in South Australia since, due to the risks of cross-infection, the Adelaide Children's Hospital would not treat those under the age of two. In 1913, Mayo and Stirling called a meeting of medical practitioners to discuss the prospect of a hospital for these children. After doubts about the practicality of such a plan were expressed, the group raised some funds and presented to the board of the Adelaide Children's Hospital a plan to use the funds to build a separate ward on the grounds of the hospital. The board rejected the proposal, so Mayo and her group rented a two-storey house in St. Peter's and opened a hospital for infants in 1914. Financial difficulties for the hospital eventually became overwhelming and the state government took over the hospital, moving it to Woodville and renaming it the Mareeba Hospital. Mayo played a central role in establishing Mareeba Hospital and forming its policy, serving as honorary physician, and as honorary responsible officer from 1921 to 1946. To combat the risks of cross-infection, she instituted a policy of strict isolation of babies from other patients. Each child had their own locker, where their own equipment would be kept, gowns used by nurses to tend to one child would only be used for that child, and blankets, bottles and floors were all sterilised. Mareeba eventually became a 70-bed hospital, complete with a surgical unit and a ward for premature babies. Later medical career In 1919, The Adelaide Children's Hospital advertised for honorary physicians. Believing that her gender would