April 2022
A pre-print study analysed 487 individual data with a median follow-up of 44 days. The authors discuss that “another important predictor of Long Covid was the presence of pre-existing conditions like diabetes and hypertension. A study from India and a systematic review on this topic has found a similar and strong association between the pre-existing condition and Long Covid. An observational paradox in our study was that the participants who took two doses of COVID-19 vaccination had higher odds of developing Long Covid.”
This observation is supported by a retrospective cohort study of 10,024 breakthrough infections, which states that:
“Risk of anxiety, depression, sleep disorder, renal disease and Long Covid features did not differ..”
“[…] compared to unvaccinated individuals, those who were vaccinated, …there was no significant difference in the risk of many other outcomes including composite of death and any Long Covid feature.”