Table 2 : Most prominent pre-existing complaints and comorbidities reported by study participants before their SARS-CoV-2 infection or in general for the SARS-CoV-2 negative control groups. PCS and ME/CFS patients reported a generally higher susceptibility to infections as indicated by frequently swollen lymph nodes, a sore throat and frequent respiratory infections. Pre-existing food intolerances were observed more often in PCS and ME/CFS patients. Only PCS patients had significantly more often pre-existing GI complaints. Anamnestic characteristics are presented in total numbers and percentages. Chi-squared testing was used to calculate the global p-values to determine in an explorative manner whether there is a significant difference between the study groups.