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How long does it take for Covid symptoms to appear with vaccine? 

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Receipt of vaccination with either an mRNA or adenoviral vector vaccine was not associated with a worsening of Long Covid symptoms, quality of life, or mental wellbeing.
Individuals with prolonged COVID-19 symptoms should receive vaccinations as suggested by national guidance.
This effect was reversed by SARS-CoV-2 vaccination, providing a potential mechanistic explanation for the vaccination-induced reduction in symptoms in patients with "Long-COVID".

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