|Vaccine type||Protein subunit|
|Other names||SARS-CoV-2 Sclamp|
V451 was a COVID-19 vaccine candidate developed by the University of Queensland and the Australian pharmaceutical company CSL Limited. The vaccine candidate used the University of Queensland's molecular clamp technology and the MF59 adjuvant.
The development of the vaccine was cancelled on 11 December 2020 during its Phase I trial, after a number of trial participants were found to give false positive test results for HIV antibodies when they did not in fact have HIV. This was due to the HIV virus fragment used as a molecular clamp leading to "a partial antibody response" to HIV. This is an undesirable outcome as it will interfere with future HIV screening tests for affected participants.
Nine days prior to the termination, on 2 December, the first emergency use authorisation had been granted to a COVID-19 vaccine; the Pfizer–BioNTech COVID-19 vaccine in the United Kingdom. Following the termination of V451, vaccine production capacity by CSL Limited was diverted to the Oxford–AstraZeneca COVID-19 vaccine.
- "UQ-CSL V451 Vaccine". www.precisionvaccinations.com. Archived from the original on 2020-12-19. Retrieved 2020-12-11.
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- Slezak, Michael (11 December 2020). "How the UQ coronavirus vaccine induced false-positive HIV test results and why scientists were prepared". ABC News.
- Smyth J (11 December 2020). "Australia abandons local Covid vaccine over HIV test concerns". Financial Times.(subscription required)
- "Covid: Australian vaccine abandoned over false HIV response". BBC News. 2020-12-11. Retrieved 2020-12-11.
- Reuters Staff (2020-12-10). "BRIEF-CSL Says Will Not Progress UQ-CSL V451 COVID-19 Vaccine Candidate To Phase 2/3 Clinical Trials". Reuters. Retrieved 2020-12-11.
- "Australia ends local COVID vaccine trials due to HIV false positives". Deutsche Welle. 11 December 2020.
- "UK medicines regulator gives approval for first UK COVID-19 vaccine". Medicines and Healthcare products Regulatory Agency (MHRA). 2 December 2020. Archived from the original on 2 December 2020. Retrieved 2 December 2020.
- "COVID-19 Update". www.csl.com. Retrieved 2021-01-31.
- Clinical trial number NCT04495933 for "A Study on the Safety, Tolerability and Immune Response of SARS-CoV-2 Sclamp (COVID-19) Vaccine in Healthy Adults" at ClinicalTrials.gov