The study also found that the effectiveness of the Pfizer and Moderna vaccines was only 29% during the omicron BA.4 and BA.5 variant phases, 20% during the BQ-dominant phase, and 4% during the XBB-dominant phase.
"The conventional SARS-CoV-2 vaccine’s ability to provide immunological protection may be significantly impacted by over-vaccination. If this happens, either newly diagnosed COVID-19 cases or people who have already contracted the virus again may have a more severe case of the illness. This concept was proposed after seeing tolerance of both the humoral and cellular immune responses to prolonged booster immunization doses."
In a turn of events characterized by profound irony, an outbreak of the SARS-CoV-2 virus, which causes COVID-19, occurred at the 2023 Epidemic Intelligence Service (EIS) Conference hosted by the U.S. Centers for Disease Control and Prevention (CDC) itself.
One of the potentially serious side effects of COVID-19 vaccination is acute ischemic stroke, according to a publication in Journal of the Neurological Sciences.