Evolution of anti-SARS-CoV-2 immune response in a cohort of French healthcare workers followed for 7 months.

OBJECTIVES: We aimed to understand the immune response among healthcare workers (HCWs) following SARS-CoV-2 infection, and to determine the infection prevalence during the first wave of the pandemic among workers in our hospital. METHODS: Determination of the serological status against SARS-CoV-2 (nucleocapsid) was offered to all HCWs. All HCWs with positive SARS-CoV-2 serology were proposed to be included in a longitudinal medical and serological follow-up (anti-spike) for 7months. RESULTS: We included 3062 HCWs; 256 (8.4%) were positive for anti-SARS-CoV-2 nucleocapsid IgG. Among them, early decrease in the anti-nucleocapsid antibody index was observed between the first (S1) and second (S2) serology samplings in 208 HCWs (84.2%). The initial anti-nucleocapsid IgG index seemed to be related to the HCWs' age. Seventy-four HCWs were included in the 7-month cohort study. Among them, 69 (90.5%) had detectable anti-spike IgG after 7months and 24 (32.4%) reported persistent symptoms consistent with post-acute COVID-19 syndrome diagnosis. CONCLUSION: The prevalence of serological positivity among HCWs was 6.7%. Infection should be followed by vaccination because of antibody decrease.

[Observational study of QuantiFERON® management for ocular tuberculosis diagnosis: Analysis of 244 consecutive tests]. / Étude observationnelle de l'usage du QuantiFERON® pour le diagnostic de tuberculose oculaire, basée sur 244 tests consécutifs.

INTRODUCTION: Ocular tuberculosis (TB) diagnosisremains difficult and quantiferon (QFT) contribution needs still yet to be specified, despite its generalization in France. The purpose of this observational study is to assess in which ocular inflammation (OI) presentation QFT is prescribed and to evaluate the added value of new QuantiFERON®-TB Gold Plus (QFT-Plus) test for diagnosis ocular TB diagnosis. PATIENTS AND METHODS: Monocentric, observational study, carried out in an ophthalmology department over a period of 5 months. Inclusion criteria were defined as an existence of an OI for which a QFT-Plus test was part of the etiological investigations. Of the 316 consecutive files, 72 were excluded (indeterminate test, prescription before anti-TNFα or immunosuppressant initiation, missing data, wrong indication) and 244 were selected and divided into two groups: group one (anterior uveitis/episcleritis, n=129) and group two (intermediate/posterior uveitis/optic neuritis/ocular myositis, n=115). All positive QFT patients underwent an etiological investigation including thoracic imaging. RESULTS: Forty-five patients, aged 52±12 years, had positive QFT (18.5%), including 18 patients for group 1 and 27 for group 2. Living in TB-endemic area, TB exposure and chest imaging abnormalities were identified in 70%, 27% and 22% of cases, respectively. OI was chronic in 36% of cases (group one, 4/18; group two, 12/27). None of the 18 patients, in group 1, received anti-tuberculosis treatment (ATT) or experienced a relapse during one-year follow-up. Four QFT+ patients, from group 2 (15%) had another associated disease explaining their uveitis. Among the 23 other patients without identified etiology, 13 had at least one relevant ophthalmological signs predictive of TB uveitis (posterior synechiae, retinal vasculitis and/or choroidal granuloma) (59%). Eleven patients received a 6-month ATT trial. Radiological abnormalities and granulomas at angiography were significantly more frequent among treated patients (p=0.03 and 0.001, respectively). A full OI recovery was observed for 8 patients (73%), considered ex-post as ocular TB. Nine patients in group 2 received rifampicin/isoniazid dual therapy for 3 months, but no conclusion could be drawn as to the benefit of such prescription on OI. QFT rate comparison, according to CD4 stimulation by ESAT-6/CFP-10 peptides or by CD4/CD8 co-stimulation, was comparable and found only 4 cases of discrepancy (1.6%). None of these 4 cases had ocular TB diagnosis. CONCLUSION: Positive QFT frequency among patients consulting for posterior OI remains high. In this study, radiological abnormalities and granulomas at angiography seemed to be more closely related to clinician decision for starting ATT trial in QFT+ patients, which was effective in 73% of cases. QFT-Plus does not seem more relevant than QFT-TB in exploring an OI. Prospective studies are necessary to codify QFT management in the etiological assessment of OI and clearly define ATT trial indications as well as their modalities.

Progressive multifocal leukoencephalopathy despite immune recovery in a HIV/HCV co-infected patient.

In HIV patients, HCV co-infection has been associated with an increased risk of progressive multifocal leukoencephalopathy (PML). Furthermore, PML has also been described in patients with cirrhosis, whether related to HCV infection or not. We describe here the case of a HIV/HCV co-infected patient with cirrhosis who developed PML despite HIV suppression and CD4 cell count above 250/mm3 for 2 years. Immunological studies performed at onset of PML and before HCV therapy showed a decrease in naïve CD4 cells (CD45RA+CCR7+CD27+ CD4+ T cells - 23% cells, i.e. 75/mm3) and NK lymphopenia with abnormal and activated NK cells (CD3- CD16+ and/or CD56+) (5% lymphocytes, i.e. 58/mm3, CD69 91%, NKp30 26%). This impaired immunity, possibly related to HIV infection, or HCV infection or cirrhosis, or a combination thereof, could have led to the development of PML.

Non-AIDS-related malignancies: expert consensus review and practical applications from the multidisciplinary CANCERVIH Working Group.

Malignancies represent a major cause of morbidity and mortality in human immunodeficiency virus (HIV)-infected patients. The introduction of combined antiretroviral therapy has modified the spectrum of malignancies in HIV infection with a decreased incidence of acquired immunodeficiency syndrome (AIDS) malignancies such as Kaposi's sarcoma and non-Hodgkin's lymphoma due to partial immune recovery and an increase in non-AIDS-defining malignancies due to prolonged survival. Management of HIV-infected patients with cancer requires a multidisciplinary approach, involving both oncologists and HIV physicians to optimally manage both diseases and drug interactions between anticancer and anti-HIV drugs. The French CANCERVIH group presents here a review and an experience of managing non-AIDS malignancies in HIV-infected individuals.

Estrogens are needed for the improvement in endothelium-mediated dilation induced by a chronic increase in blood flow in rat mesenteric arteries.

Resistance arteries play a key role in the control of local blood flow. They undergo outward remodeling in response to a chronic increase in blood flow as seen in collateral artery growth in ischemic disorders. We have previously shown that mesenteric artery outward remodeling depends on the endothelial estrogen receptor alpha. As outward arterial remodeling is associated with improved endothelium-dependent dilation, we hypothesized that estrogens might also play a role in flow-mediated improvement of endothelium-dependent dilation. Local increase in blood flow in first order mesenteric arteries was obtained after ligation of adjacent arteries in three-month old ovariectomized female rats treated with 17-beta-estradiol (OVX+E2) or vehicle (OVX). After 2 weeks, diameter was equivalent in high flow (HF) than in normal flow (NF) arteries with a greater wall to lumen ratio in HF vessels in OVX rats. Acetylcholine-mediated relaxation was lower in HF than in NF vessels. eNOS and caveolin-1 expression level was equivalent in HF and NF arteries. By contrast, arterial diameter was 30% greater in HF than in NF arteries and the wall to lumen ratio was not changed in OVX+E2 rats. Acetylcholine-mediated relaxation was higher in HF than in NF arteries. The expression level of eNOS was higher and that of caveolin-1 was lower in HF than in NF arteries. Acetylcholine (NO-dependent)-mediated relaxation was partly inhibited by the NO-synthesis blocker L-NAME in OVX rats whereas L-NAME blocked totally the relaxation in OVX+E2 rats. Endothelium-independent relaxation (sodium nitroprusside) was equivalent in OXV and OVX+E2 rats. Similarly, serotonin- and phenylephrine-mediated contractions were higher in HF than in NF arteries in both OVX and OVX+E2 rats in association with high ratio of phosphorylated ERK1/2 to ERK1/2. Thus, we demonstrated the essential role of endogenous E2 in flow-mediated improvement of endothelium (NO)-mediated dilatation in rat mesenteric arteries.

Epstein-Barr virus-driven B Cell Proliferation with CD4+ T Cell Expansion: A Lymphomatoid Granulomatosis-like Disease Related to Hyperinterleukin-10 Secretion of Remarkably Favourable Outcome with Rituximab.

Granulomatous lymphomatosis is an Epstein-Barr virus (EBV)-driven B cell proliferation associated with an exuberant CD4(+) T cell reaction with usually histopathological pictures of angiocentrism. So far, the characteristics of CD4(+) T cells in granulomatous lymphomatosis and the mechanism leading to their expansion remain poorly explored. We report a 56-year-old female with a past history of cold agglutinin disease, which was successfully treated with 4 weekly infusions of rituximab. She presented one year later with features of granulomatous lymphomatosis that resulted in severe lung and bone marrow infiltration. We provide evidence that CD4(+) T cell expansion was oligoclonal, involved anergic cells and did not result from an EBV-driven stimulation. Rather, it resulted possibly from a high production of interleukin-10 by immunoblastic EBV-positive B cells. The outcome was remarkably favourable with rituximab and steroids. Our results suggest that an EBV-driven B cell proliferation should be investigated in patients presenting with a CD4(+) T cells alveolitis or other systemic manifestations resulting from a CD4(+) T cell expansion. These features should prompt to introduce an immunosuppressive therapy including steroids and rituximab. Our results deserve further investigations to confirm our pathophysiological hypotheses in CD4(+) T cell expansions associated with EBV-driven B cell proliferations and to assess whether granulomatous lymphomatosis could result from comparable mechanisms.

Soluble biomarkers of immune activation and inflammation in HIV infection: impact of 2 years of effective first-line combination antiretroviral therapy.

OBJECTIVES: The aim of the study was to assess the impact of rapid and sustained viral control produced by combination antiretroviral therapy (cART) on HIV-associated immune activation and inflammation. METHODS: In this longitudinal observational study, we examined changes in interleukin-6 (IL-6), interferon-γ-inducible protein-10 (IP-10), monokine induced by interferon-γ (MIG) and soluble CD14 (sCD14) levels during 2 years of effective first-line cART. Biomarker levels before and after cART were compared with those observed in healthy subjects, using the Wilcoxon signed rank test. Elevated biomarker levels were defined with respect to values for healthy subject (mean + 2 standard deviations). Factors associated with persistently elevated biomarker levels after 2 years of cART were identified by logistic regression. RESULTS: We included in the study 139 patients with a median HIV-1 RNA level of 4.8 log10 HIV-1 RNA copies/mL and a median CD4 cell count of 294 cells/µL at cART initiation [day 0 (D0)]. At D0, all biomarker levels were higher than in healthy subjects (P < 0.05). After 2 years of cART, IL-6, IP-10 and MIG levels fell significantly, by a median of 0.54, 420 and 1107 pg/mL, respectively (all P < 0.001), and were no longer elevated in > 75% of patients. In contrast, sCD14 levels did not change significantly (0.18 × 10(6) pg/mL; P = 0.102) and remained elevated. Older age was associated with elevated levels of IP-10 [odds ratio (OR) 1.60 per 10 years older; P = 0.047] and MIG (OR 1.92 per 10 years older; P = 0.007) after 2 years of cART. CONCLUSIONS: The rapid and sustained viral suppression produced by first-line cART reduced IL-6, IP-10 and MIG to normal levels, while sCD14, a marker of monocyte activation, remained elevated. High levels of IP-10 and MIG tended to persist in older patients.

Role of estrogens and age in flow-mediated outward remodeling of rat mesenteric resistance arteries.

In resistance arteries, a chronic increase in blood flow induces hypertrophic outward remodeling. This flow-mediated remodeling (FMR) is absent in male rats aged 10 mo and more. As FMR depends on estrogens in 3-mo-old female rats, we hypothesized that it might be preserved in 12-mo-old female rats. Blood flow was increased in vivo in mesenteric resistance arteries after ligation of the side arteries in 3- and 12-mo-old male and female rats. After 2 wk, high-flow (HF) and normal-flow (NF) arteries were isolated for in vitro analysis. Arterial diameter and cross-sectional area increased in HF arteries compared with NF arteries in 3-mo-old male and female rats. In 12-mo-old rats, diameter increased only in female rats. Endothelial nitric oxide synthase expression and endothelium-mediated relaxation were higher in HF arteries than in NF arteries in all groups. ERK1/2 phosphorylation, NADPH oxidase subunit expression levels, and arterial contractility to KCl and to phenylephrine were greater in HF vessels than in NF vessels in 12-mo-old male rats only. Ovariectomy in 12-mo-old female rats induced a similar pattern with an increased contractility without diameter increase in HF arteries. Treatment of 12-mo-old male rats and ovariectomized female rats with hydralazine, the antioxidant tempol, or the angiotensin II type 1 receptor blocker candesartan restored HF remodeling and normalized arterial contractility in HF vessels. Thus, we found that FMR of resistance arteries remains efficient in 12-mo-old female rats compared with age-matched male rats. A balance between estrogens and vascular contractility might preserve FMR in mature female rats.

Key role of estrogens and endothelial estrogen receptor α in blood flow-mediated remodeling of resistance arteries.

OBJECTIVE: Flow- (shear stress-)mediated outward remodeling of resistance arteries is involved in collateral growth during postischemic revascularization. As this remodeling is especially important during pregnancy, we hypothesized that estrogens may be involved. A surgical model eliciting a local increase in blood flow in 1 mesenteric resistance artery was used in 3-month-old ovariectomized female rats either treated with 17-ß-estradiol (E2) or left untreated. METHODS AND RESULTS: After 14 days, arterial diameter was greater in high-flow arteries than in normal-flow vessels. An ovariectomy suppressed high-flow remodeling, while E2 restored it. High-flow remodeling was absent in mice lacking the estrogen receptor α but not estrogen receptor ß. The kinetics of inflammatory marker expression, macrophage infiltration, oxidative stress, and metaloproteinases expression were not altered by the absence of E2 after 2 and 4 days, that is, during remodeling. Nevertheless, E2 was required for the increase in endothelial nitric oxide synthase expression and activation at day 4 when diameter expansion occurs. Finally, the impact of E2 on the endothelium appeared crucial for high-flow remodeling, as this E2 action was abrogated in mice lacking endothelial NOS, as well as in Tie2-Cre(+) ERα(f/f) mice. CONCLUSIONS: We demonstrate the essential role of E2 and endothelial estrogen receptor α in flow-mediated remodeling of resistance arteries in vivo.

Performance of Quantiferon(®) for the diagnosis TB.

OBJECTIVES: The aim of the study was to evaluate the performance of Quantiferon Gold-In-Tube(®) (QFN) for the diagnosis of tuberculosis (TB) during hospitalization in an infectious diseases department. PATIENTS AND METHODS: QFN was performed in 245 patients recently hospitalized for suspected TB. Subsets of patients underwent tuberculin skin tests (TST), and microbiological cultures were performed. RESULT: TB was diagnosed in 57 (23%) patients: pulmonary in 23 (40%), extrapulmonary in 16 (28%), and disseminated in 18 (32%). Seventeen (30%) of these TB patients were immunocompromised, including 12 with HIV infection. The sensitivity of QFN was 74%, its specificity 56%, its positive predictive value 43% and negative predictive value (NPV) 92%. The sensitivity was similar in pulmonary and extrapulmonary TB but lower in disseminated TB, although not significantly so. The sensitivity was also lower (P=0.04) in immunocompromised patients. The specificity was lower in migrants than in native French patients (P=0.01), and lower in patients with a history of TB than in those without (P<0.001). Finally, combining culture with QFN significantly increased the sensitivity (P=0.008), and produced a higher NPV, as for the combination with TST, but not significantly different than with QFN alone. CONCLUSION: The performance of QFN was weak in this context, especially in subgroups at high risk for latent TB. However, combined negative results of QFN or TST and culture could be useful to rule out active TB.

[Etiology of ecthyma gangrenosum: four cases]. / Etiologie de l'ecthyma gangréneux (quatre cas).

INTRODUCTION: Ecthyma gangrenosum (EG) starts as an erythematous or purpuric macule, papule or plaque that develops into a haemorrhagic bulla, which becomes a necrotic black sore. EG is usually a cutaneous manifestation of Pseudomonas aeruginosa infection but other microbial agents can be involved. OBSERVATION: Four patients (three women and one man, mean age: 36 years) with fever and cutaneous black sores characteristic of EG were hospitalized. Three were cardiac transplant recipients treated with immunosuppressant drugs and one had end-stage acute myeloid leukaemia. All had cutaneous necrotic black sores. Blood cultures isolated in one case P. aeruginosa and Candida albicans. Bacteriological culture of cutaneous swabs from necrotic lesions revealed C. albicans and P. aeruginosa in two cases, respectively. The cutaneous black sores healed with appropriate antimicrobial treatment. Three patients were cured but the patient with leukaemia died despite therapy. DISCUSSION: These four cases illustrate the clinical polymorphism of EG and the broad spectrum of aetiologies. While EG is primarily considered a cutaneous manifestation of P. aeruginosa infection, other microbial agents such as C. albicans may be responsible, as in two of our cases.

Notch3 is a major regulator of vascular tone in cerebral and tail resistance arteries.

OBJECTIVE: Notch3, a member of the evolutionary conserved Notch receptor family, is primarily expressed in vascular smooth muscle cells. Genetic studies in human and mice revealed a critical role for Notch3 in the structural integrity of distal resistance arteries by regulating arterial differentiation and postnatal maturation. METHODS AND RESULTS: We investigated the role of Notch3 in vascular tone in small resistance vessels (tail and cerebral arteries) and large (carotid) arteries isolated from Notch3-deficient mice using arteriography. Passive diameter and compliance were unaltered in mutant arteries. Similarly, contractions to phenylephrine, KCl, angiotensin II, and thromboxane A2 as well as dilation to acetylcholine or sodium nitroprusside were unaffected. However, Notch3 deficiency induced a dramatic reduction in pressure-induced myogenic tone associated with a higher flow (shear stress)-mediated dilation in tail and cerebral resistance arteries only. Furthermore, RhoA activity and myosin light chain phosphorylation, measured in pressurized tail arteries, were significantly reduced in Notch3KO mice. Additionally, myogenic tone inhibition by the Rho kinase inhibitor Y27632 was attenuated in mutant tail arteries. CONCLUSIONS: Notch3 plays an important role in the control of vascular mechano-transduction, by modulating the RhoA/Rho kinase pathway, with opposite effects on myogenic tone and flow-mediated dilation in the resistance circulation.

Bioterrorism: management of major biological agents.

Bioterrorism is defined by the intentional or threatened of microorganisms or toxins derived from living organisms to cause death or diseases in humans, animals or plants on which we depend. The other major point is to generate fear in the population. More than 180 pathogens have been reported to be potential agents for bioterrorism. The following is an overview of several agents that could be involved in a biological attack.

Pulmonary manifestations of multicentric Castleman's disease in HIV infection: a clinical, biological and radiological study.

The aim of the present study was to report clinical, radiological and bronchoalveolar lavage (BAL) findings in patients with pulmonary manifestations of HIV-associated multicentric Castleman's disease (MCD). This was a retrospective study of 12 patients with histologically proven MCD. Clinical manifestations were as follows: dyspnoea (nine out of 12 cases), cough (n = 10), bilateral crackles (n = 10), together with high fever, malaise, peripheral lymphadenopathy (n = 12), and hepatosplenomegaly (n = 10). Two patients developed acute respiratory distress syndrome. Chest radiographs and computed tomography scans showed reticular (n = 7) and/or nodular (n = 7) interstitial patterns, with mediastinal lymphadenopathy (n = 9), and bilateral pleural effusion (n = 3). Fibreoptic endoscopy was normal in all cases. BAL analysis showed hypercellularity (n = 6) and/or lymphocytosis (n = 6), and human herpesvirus-8 DNA was detected in two out of two cases. Specific stains and cultures for pathogens were negative. All patients received etoposide and/or vinblastine, and improved after 2-4 days. Relapses were frequent (50 attacks in 12 patients). Six patients developed a non-Hodgkin's lymphoma, and five died. In conclusion, the pulmonary manifestation of HIV-related multicentric Castleman's disease is an acute reticulo-nodular interstitial pneumonitis, associated with severe systemic symptoms and peripheral lymphadenopathy. In bronchoalveolar lavage fluid, cellularity is not specific and human herpesvirus-8 DNA is detected. The clinical course is specific due to a rapid onset and regression, frequent relapses and a high occurrence of non-Hodgkin's lymphoma.

Morphology, homogeneity and functionality of human monocytes-derived macrophages.

Primary cultures of human monocyte-derived macrophages (n = 50) were characterized in order to use this cellular model to establish a proteomic map of macrophages. Peripheral blood mononuclear cells were isolated from healthy donors' blood using density gradient centrifugation. The cell culture quality was checked in respect of several morphological and molecular aspects. The homogeneity and purity of cells was assessed after 12 days' primary culture with phase microscopy, immunocytochemistry and flow cytometry. Monocytes were completely differentiated into macrophages within 12 days as shown by phase microscopy. On day 12, all cells expressed CD68 antigen and were negative for CD3. Flow cytometry experiments showed a purity of the primary culture on day 12, in a range between 76% and 98% of CD14+ cells. The functionality of cells was characterized for the presence of ECE-1 as an intracellular marker and for the presence of MMP-9 as a marker secreted into the culture medium. This study allowed to determine criteria of quality and functionality for the primary culture of monocyte-derived macrophages. Cultures meeting these criteria will be used for the proteomic analysis and the establishment of the reference map.

[Severe acute respiratory syndrome: update]. / Actualités sur le syndrome respiratoire aigu sévère.

INTRODUCTION: The severe acute respiratory syndrome (SARS) has recently been recognised as a new clinical entity and a new emerging infectious disease that is highly contagious with significant mortality. CURRENT KNOWLEDGE AND KEY POINTS: By the end of 17 June 2003, a total of 8500 cases included 800 deaths had been reported from 30 countries. The cause of SARS has been identified as a new corona virus. In this manuscript, we describe the clinical features, biological findings, virological tests, radiological assessment, outcome and treatments of this infection. FUTURE: Research on specific therapies and vaccines is on-going.