Pfizer says 3rd COVID vaccine dose might be needed, seeking authorization for booster shot<br/><a href="https://www.khou.com/article/news/health/coronavirus/vaccine/pfizer-covid-vaccine-third-dose-booster/285-85fc5e0e-efde-48a7-85d6-4cb0e0511910" rel="noreferrer noopener" target="_blank">khou.com</a>