New combo vaccine study: COVID-19 and flu shot together in one visit
NCT ID NCT06279871
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tested a new type of COVID-19 vaccine (ARCT-2303) in adults who had already received a COVID-19 vaccine. Some participants got the COVID-19 vaccine at the same time as the seasonal flu shot, while others got it alone. The goal was to see if the combination was safe and produced a strong immune response. About 1,500 healthy adults took part.
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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Locations
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Australian Clinical Research Network (ACRN)
Sydney, New South Wales, Australia
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Austrials - St. Leonards
Sydney, New South Wales, Australia
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Austrials -Sunshine
Melbourne, Victoria, Australia
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CMAX
Adelaide, South Australia, Australia
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Clinitrials - Mount Site
Perth, Western Australia, Australia
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Clínica San Agustín
San José, Costa Rica
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Deposito de Medicamentos de Investigación Cousin Agustín (DEMEDICA)
San Pedro Sula, Honduras
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Emeritus Research Melbourne
Melbourne, Victoria, Australia
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Emeritus Research Sydney
Sydney, New South Wales, Australia
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Far Eastern University - Nicanor R. M Foundation
Quezon City, Philippines
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Griffith University Clinical Trials Unit
Sydney, New South Wales, Australia
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IICIMED
San José, Costa Rica
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Inversiones en Investigación Médica S.A (INVERIME)
Tegucigalpa, Honduras
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Northern Beaches Clinical Research - Walski
Sydney, New South Wales, Australia
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Nucleus Network
Melbourne, Victoria, Australia
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Nucleus Network Brisbane (Q-Pharm)
Brisbane, Queensland, Australia
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Organización y centro de investigación clínica Ochoa (OCINCO)
Comayagua, Honduras
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Paratus Clinical Blacktown
Sydney, New South Wales, Australia
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Paratus Clinical Brisbane
Brisbane, Queensland, Australia
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Paratus Clinical Canberra
Canberra, Australian Capital Territory, Australia
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Paratus Clinical Central Coast
Central Coast, New South Wales, Australia
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Sutherland Shire Clinical Research - Walski
Miranda, New South Wales, Australia
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The Peter Doherty Institute for Infection and Immunity
Melbourne, Victoria, Australia
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Tropical Disease Foundation - Putatan Health Center
City of Muntinlupa, Philippines
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USC Morayfield
Morayfield, Queensland, Australia
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USC Sippy Down
Sunshine Coast, Queensland, Australia
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USC Southbank
Brisbane, Queensland, Australia
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Veritus Research
Melbourne, Victoria, Australia
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Wollongong Clinical Research
Wollongong, New South Wales, Australia