Apr 25 2024 São Paulo Research Foundation (FAPESP) A major bivalent COVID-19 vaccine induces production of neutralizing antibodies against the coronavirus that circulated at the start of the pandemic as well as subvariants of omicron, albeit less abundantly, according to a Brazilian study reported in the  Journal of Medical Virology . The study confirmed the vaccine's effectiveness and its importance to control of the disease, while also showing that, more than three years after the first