Jones, Cheryl, Centre for Perinatal Infection Research, The Children’s Hospital at Westmead, New South Wales, Australia; National Centre for Immunisation Research and Surveillance, The Children’s Hospital at Westmead, New South Wales, Australia; Sydney Medical School, The University of Sydney, New South Wales, Australia; Marie Bashir Institute for Infectious Diseases & Biosecurity, University of Sydney, New South Wales, Australia, Australia