Research conducted in the US provided fresh evidence that long COVID can happen even after infections in vaccinated people with older adults at higher risk of long-term side effects. In the study 1/3rd of the elderly population showed signs of long COVID. A separate report published by CDC showed that after breakthrough infection 1 in every 4 adults aged 65 and above had 1 potential long COVID symptom in comparison to every 5th younger adult. 

The coronavirus vaccine helps in preventing initial infection and serious outcomes. About 1% of individuals develop a breakthrough infection, according to the study results published in Nature Medicine in which 13 million veteran reports were reviewed. 

Overall, 32% had long COVID symptoms for up to 6 months in comparison to 36% of unvaccinated veterans after breakthrough infection. Long COVID symptoms such as breathing problems, and muscle aches, were the most common conditions. Strokes, brain fog, and kidney failure were the high-risk factors observed among older adults. The author stated that this stressed the need to hasten long-term care for older adults along with the routine assessment of all COVID patients.

(Source: https://www.hindustantimes.com/lifestyle/health/long-covid-affects-more-older-adults-shots-don-t-prevent-it-101653540056217.html )