False Positive Results in SARS-CoV-2 Serological Tests for Samples From Patients With Chronic Inflammatory Diseases

Gastrointestinal Manifestations in Patients Infected with SARS-CoV-2

Coronavirus disease 2019, caused by severe acute respiratory syndrome coronavirus 2, has recently become the number one problem affecting global health. Coronavirus disease 2019 is principally recognized by its respiratory manifestations; however, recent studies have shown an increasing number of patients with gastrointestinal complaints like diarrhea, nausea, vomiting, and abdominal discomfort...

Essential mixed cryoglobulinaemia with false-positive serological tests for syphilis.

Analysis of serum from a patient with cutaneous leukocytoclastic vasculitis showed a mixed cryoglobulin with a monoclonal IgM kappa-antiglobulin component (6.5 mg/ml), strong rheumatoid factor activity (latex titre 1/5000), and positive serological tests for syphilis (fluorescent treponemal antibody-absorbed and Treponema pallidum haemagglutination assay). After removal of antiglobulin activity...

Experimental Protocol for Detecting SARS-CoV-2 in Screenings and Grit Samples of Wastewater Treatment Plants

Introduction: Although various liquid, solid, and gaseous streams of wastewater treatment plants (WWTPs) have been analyzed in many studies for the presence of SARS-CoV-2 RNA, no study was found to sample and detect SARS-CoV-2 RNA in screenings and grit samples separated from primary treatment units of WWTP. Hence, this study aims to provide an experimental protocol for sampling and extracting ...

Biological false positive serological tests for syphilis among drug addicts.

The biological false positive reaction to serological tests for syphilis.

Acute and chronic biological false positive reactions to serological tests for syphilis are discussed. Three cases are presented, one showing an acute and one a chronic reaction, and one in which it was not possible to determine if the reaction was acute or chronic. Once a biological false positive reaction is found, serum from the patient should be tested at intervals for at least six months t...