Scientists report in Science Advances that a single-shot combined vaccine produced protective immune responses in animals. The research comes after several years in which influenza, COVID-19 and RSV circulated together and stressed health systems.
The team used a vaccine platform called CoPoP to deliver five viral proteins in one injection: three influenza proteins plus SARS-CoV-2 and RSV proteins. The formulation included immune-stimulating ingredients PHAD and QS-21 to boost potency. CoPoP attaches proteins to nanoparticles using histidine tags (his-tags) that bind cobalt ions.
Corresponding author Jonathan Lovell said the combined shot produced antibody responses similar to those from single-virus vaccines. Coauthor Bruce Davidson noted that many people skip recommended respiratory vaccines because it can be inconvenient, and a single annual shot could improve uptake. The researchers saw no evidence of immune interference but caution that further studies are needed before clinical use.
Difficult words
- vaccine — medicine given to prevent an infectionvaccines
- platform — system used to deliver vaccine or therapy
- formulation — mixture of ingredients in a vaccine
- antibody — protein made by the immune system
- nanoparticle — very small particle used in medicinenanoparticles
- histidine tag — short protein piece that binds metalshistidine tags
- immune interference — when immune reactions reduce vaccine effectiveness
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Discussion questions
- Would you be more likely to get a single annual combined vaccine for flu, COVID-19 and RSV? Why or why not?
- What advantages and concerns do you see for giving five viral proteins in one injection?
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