As of my last update in January 2022, several vaccines for COVID-19 had been developed and authorized for emergency use. Many of these vaccines have shown high efficacy rates in preventing severe illness and reducing transmission. However, the success of a new vaccine depends on various factors such as its safety profile, efficacy against emerging variants, distribution, and public acceptance. While there's no guarantee, the rigorous testing and approval processes aim to ensure the safety and effectiveness of vaccines before they are made available to the public.