This is likely because other components of the immune response (T cells and immune memory cells) stay in the body for longer than antibodies and prevent serious illness. On a positive note, protection against serious COVID illness, including hospitalisation or death, does not seem to be reduced to the same extent, only by about 8 percentage points. Will Australia follow Europe into a fourth COVID wave? Boosters, vaccinating kids, ventilation and masks may help us avoid it Vaccine effectiveness against COVID infection decreases, on average, by 18.5 percentage points, six months after completing vaccination. The Conversation, CC BY-ND How much does immunity wane after 2 doses?Īntibodies decrease over a period of six months or more after the second dose of COVID vaccine. University of Sydney and Australian National University provide funding as members of The Conversation AU. Jean Li-Kim-Moy does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment. He has received funding from NHMRC and ARC in relation to vaccine research.
Robert Booy consults to all vaccination companies in Australia and works one day a week for Vaxxas.
NCIRS receives service contract funding from the Australian Government Departments of Health, NSW and other state government Departments of Health. Infectious Disease Paediatrician and Senior Professorial Fellow, National Centre for Immunisation Research and Surveillance, University of SydneyĬyra Patel is an employee at the National Centre for Immunisation Research and Surveillance (NCIRS). General Paediatrician Research Fellow, National Centre for Immunisation Research and Surveillance, University of Sydney Senior Research Officer, National Centre for Immunisation Research and Surveillance PhD candidate, Australian National University
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