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This study observed that sera from Covaxin-vaccinated individuals showed reduced neutralization ability against the Omicron variant compared to B.1, Beta, and Delta variants, with breakthrough infections boosting immune response more effectively than vaccination alone.

In this study, 2% of healthcare workers vaccinated with Covaxin or Covishield reported new skin reactions, with a slightly higher incidence following Covaxin; significant differences were observed among paramedical staff.

In this study, 19.6% of COVID-19 vaccine recipients reported post-vaccination mucocutaneous effects, mostly mild and self-limiting; the reactions were similarly frequent for Covishield and Covaxin.