There are several vaccines which will immunize you against COVID-19 – that it is, they will help prevent you from catching it. They do not cure it if you do catch it.
COVID-19’s effects vary among individuals, ranging from none at all to mild flu-like symptoms to difficulty breathing and pneumonia. Serious cases can require hospitalisation and life-support measures and may still, sadly, result in death.
Seniors are most at risk for severe complications. People with conditions like breathing disorders (asthma, COPD, sleep apnea, etc.) and whose immune systems have been compromised (diabetes, immunosuppressing medications etc.) are at high risk.
COVID-19 is a respiratory illness. It affects your ability to breathe. This can deprive your other organs of needed oxygen and cause them to fail. Liver, kidneys, heart and muscles can all shut down.