Researchers deliberately infect participants with SARS-CoV-2 in ‘challenge’ trials — but high levels of immunity complicate efforts to test vaccines and treatments. Researchers deliberately infect participants with SARS-CoV-2 in ‘challenge’ trials — but high levels of immunity complicate efforts to test vaccines and treatments.
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Few of us may have heard of this virus, but now leading scientists warn that RSV (respiratory syncytial virus) poses a significant threat to some people s health.