The mRNA vaccines (RVs) can reduce the severity and mortality of severe acute respiratory syndrome coronavirus (SARS-CoV-2). However. almost only the inactivated vaccines (IVs) but no RVs had been used in mainland China until most recently. and the relaxing of its anti-pandemic strategies in December 2022 increased concerns about new outbreaks. https://foldlyers.shop/product-category/sponges/