Public health officials advise an annual Covid-19 booster shot, akin to the flu vaccine, to be taken prior to winter. This is especially important for high-risk groups like seniors, immunocompromised individuals, and those with chronic conditions. While previous infections and vaccinations offered immunity, it diminishes with time. Even if previously infected, vaccination is beneficial. A monovalent vaccine targeting the emerging XBB.1.5 variant is now accessible in the Czech Republic, covered by insurance. Covid and flu vaccines can be administered together or with a two-week interval for safety.