evidence: Studies show that COVID-19 vaccines reduce the risk of getting this disease. The vaccine will also help keep you from getting seriously ill or having to go to the hospital if you do get COVID-19. We are still learning how effective COVID-19 vaccines are against new variants of the virus. Read more about COVID-19 vaccine effectiveness. The Centers for Disease Control and Prevention (CDC) recommends that older adults stay up to date with COVID-19 vaccines, including booster shots. Read more about COVID-19 vaccines from the CDC. [...] Vaccines are very safe, and they can help keep you from getting serious or life-threatening diseases. The most common side effects for all these vaccines are mild and may include pain, swelling, or redness where the vaccine was given.