Objectives Since the onset of the COVID-19 pandemic, cases of reinfection with the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have been reported, raising additional public health concerns. SARS-CoV-2 reinfection was assessed in healthcare workers in Tunisia, as they are at the greatest exposure to infection by different variants. Methods We conducted whole-genome sequencing of the viral RNA from clinical specimens at the initial infection and suspected second infection from four healthcare workers, working at the Habib Bourguiba University Hospital (Sfax, Tunisia), who were retested positive for SARS-CoV-2 by RT-PCR after recovery from a first infection. A total of 8 viral RNAs from the patients’ respiratory specimens were obtained, which allowed us to characterize the differences between viral genomes from initial infection and positive retest. The serology status for total Ig, IgG, and IgM against SARS-CoV-2 was also determined and followed after the first infection. Results We confirmed by whole-genome sequencing of the viral samples that all four cases experienced a reinfection event. The interval between the two infection events ranged from 45 to 141 days and symptoms were milder in the second infection for two patients and more severe for the two remaining cases. Reinfection occurred for all four cases, despite the presence of antibodies for three of them. Conclusion This study adds to the rapidly growing evidence of COVID-19 reinfection, where viral sequences were used to confirm infection by distinct isolates of SARS-CoV-2 in healthcare workers. These findings suggest that individuals, who are exposed to different SARS-CoV-2 variants, might not acquire sufficiently protective immunity through natural infection and emphasis the necessity of their vaccination and the regular follow-up of their immune status both in quantitative and qualitative terms.

This study found that the outcome of scorpion-stung patients has clearly improved. This enhancement can be explained by early medical consultation and standardized management of patients with predictive factors for cardiac dysfunction.

In patients with moderate scorpion envenomation with positive T wave, high values of troponin suggest the presence of cardiac dysfunction.

Objective: To identify the early predictors of severe envenomation in the southern region of Tunisia. Methods: It was a retrospective monocentric study including consecutive patients admitted to the emergency department for snakebite envenomation. Snakebite envenomation was defined by a history of snakebite. Predictors of severe envenomation were determined by univariate and multivariate analyses. Results: Our sample consisted of 109 patients aged 30 (20-44) years with a 1.1:1 sex-ratio (56 males and 53 females). During the 24-hour surveillance period, 25 patients developed severe envenomation (22.9%). The in-hospital mortality rate was 4.6% (n=5). The independent predictors of severe snakebite envenomation were leucocyte count over 11 550/mm3 (OR: 18.7, 95% CI: 3.3-107.8), creatine kinase over 155 IU/L (OR: 6.16, 95% CI: 1.1-35.6), and/or tourniquet before arrival to the ED (OR: 32.14, 95% CI: 3.5-295.9). Conclusions: This study emphasizes the importance of early evaluation of snakebite envenomation. Further studies are required to approve a severity scale proper to snakebite envenomation in Tunisia.

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