Post-COVID-19 vaccination side effects cannot be clearly differentiated from the early symptoms of the virus, according to new findings led by researchers at King’s College London and published last week in the eClinical Medicine journal. Researchers who conducted the study, titled “Disentangling post-vaccination symptoms from early COVID-19” noted that “some individuals experience systemic symptoms post-vaccination, which overlap with COVID-19 symptoms.” Scientists sought to differentiate the two by comparing early post-vaccination symptoms in individuals who subsequently tested positive or negative for SARS-CoV-2, using data from the COVID Symptom Study (CSS) app, formerly the COVID Symptom Tracker, an epidemiological research mobile app developed in the United Kingdom. The study analyzed data from 362,770 UK users of the CSS App aged between 16–90 years who had been vaccinated between Dec. 8, 2020 and May 17, 2021, and who subsequently reported at least one symptom associated with COVID-19 within the first seven days of vaccination, other than local …