Skip to main content

Thank you for visiting You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.


Timing matters for COVID vaccine effectiveness

Pediatric COVID Vaccinations During Omicron in San Francisco.

People under 20 or over 50 reaped the biggest extra benefit from SARS-CoV-2 vaccinations administered between late morning and early afternoon. Credit: Santiago Mejia/The San Francisco Chronicle/Getty

Access options

Rent or buy this article

Prices vary by article type



Prices may be subject to local taxes which are calculated during checkout

Nature 617, 226 (2023)



  1. Hazan, G. et al. J. Clin. Invest. (2023).

    Article  Google Scholar 

Download references


Latest on:

Nature Careers


Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing


Quick links