Fitzgerald, Tove, Peter Massey, and Fakhrul Islam. “Changes in Invasive Pneumococcal Disease Serotypes in a Regional Area of Australia Following Three Years of 7vPCV Introduction”. Western Pacific Surveillance and Response 3, no. 2 (May 30, 2013). Accessed April 20, 2024. https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/145.