Polio vaccine poliomyelitis per million doses given. This compares with 5,000 cases per million who are paralysed following a polio infection. Both are generally safe to give during pregnancy and in those who have HIV/AIDS but are otherwise well. The first polio vaccine was the inactivated polio vaccine. It was developed by Jonas Salk and came into use in 1955. The oral polio vaccine was developed by Albert Sabin and came into commercial use in 1961. They are on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system. The wholesale cost in
David Bruce (microbiologist) David Bruce (microbiologist) Major-General Sir David Bruce (29 May 1855 in Melbourne – 27 November 1931 in London) was a Scottish pathologist and microbiologist who investigated Malta fever (later called brucellosis in his honour) and African trypanosomiasis (sleeping sickness in humans and nagana in animals). He discovered a protozoan parasite transmitted by insects, later named "Trypanosoma brucei" after him. Working in the Army Medical Service and the Royal Army Medical Corps, his major scientific collaborator was his microbiologist wife Mary Elizabeth Bruce ("née" Steele), with whom he published more than thirty technical papers. Bruce was born in Melbourne, Australia to