This cohort study examines the rate of SARS-CoV-2 reinfection among people in Lombardy, Italy, who previously recovered from COVID-19.

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Our data strongly support the presence of evident rhythmic patterns in the incidence of acute aortic events, characterized by significantly higher risk in Winter, in December, on Monday and between 6 am and 12 pm. Future studies are needed to better clarify the underlying mechanisms and clinical implications.

BACKGROUND Patients with suspected deep vein thrombosis (DVT) of the lower limb represent a diagnostic dilemma for general practitioners. Compression ultrasonography (US) is universally recognized as the best test of choice. We assessed the diagnostic accuracy of compression US performed by general practitioners given short training in the management of symptomatic proximal DVT.METHODS From May 2014 to May 2016, we evaluated in a multicenter, prospective cohort study all consecutive outpatients with suspected DVT; bilateral proximal lower limb compression US was performed by general practitioners and by physicians expert in vascular US, each group blinded to the other's findings. In all examinations with a negative or nondiagnostic result, compression US was repeated by the same operator after 5 to 7 days. Inter-observer agreement and accuracy were calculated. RESULTSWe enrolled a total of 1,107 patients. The expert physicians diagnosed DVT in 200 patients, corresponding to an overall prevalence of 18.1% (95% CI, 15.8%-20.3%). The agreement between the trained general practitioners and the experts was excellent (Cohen κ = 0.86; 95% CI, 0.84-0.88). Compression US performed by general practitioners had a sensitivity of 90.0% (95% CI, 88.2%-91.8%) and a specificity of 97.1% (95% CI, 96.2%-98.1%) with a diagnostic accuracy for DVT of 95.8% (95% CI, 94.7%-97.0%).CONCLUSIONS Our results suggest that, even in hands of physicians not expert in vascular US, compression US can be a reliable tool in the diagnosis of DVT. We found that the sensitivity achieved by general practitioners appeared suboptimal, however, so future studies should evaluate the implementation of proper training strategies to maximize skill. 2017;15:535-539. https://doi.org/10.1370/afm.2109. Ann Fam Med INTRODUCTIONP atients with clinical signs and symptoms of deep vein thrombosis (DVT) of the lower limbs represent a diagnostic dilemma for general practitioners.1 Reliance on clinical findings alone can lead to misdiagnosis, unnecessary exposure to anticoagulant therapy, and high associated costs. Rapid and accurate diagnosis of DVT is therefore needed to start prompt anticoagulation therapy and reduce the risk of potentially fatal pulmonary embolism.2,3 For these reasons, in general practice, the optimal diagnostic strategy for DVT has long been debated: the Wells score is not accurate enough for use in primary care, 4 but strategies that require d-dimer testing 5 are not always accessible. Compression ultrasonography (US) is considered the more widespread method of choice for confirming or ruling out the diagnosis of DVT, and its use has been validated in several prospective studies 3,[6][7][8] 536by hospitalists, radiologists, emergency physicians, or trained nurses.9-11 A more rapid diagnosis, directly obtained by general practitioners in primary care, could likely improve appropriate management of DVT, avoiding in-hospital evaluations and any pretest scores or laboratory evaluations. We undertook a prospective, multicenter cohort study to...