Signal peptide and N-glycosylation of N-terminal-CD2v determine the hemadsorption of African swine fever virus.

IMPORTANCE: African swine fever virus (ASFV) is the cause of the current major animal epidemic worldwide. This disease affects domestic pigs and wild boars, has spread since 2007 through Russia, Eastern Europe, and more recently to Western European countries, and since 2018 emerged in China, from where it spread throughout Southeast Asia. Recently, outbreaks have appeared in the Caribbean, threatening the Americas. It is estimated that more than 900,000 animals have died directly or indirectly from ASFV since 2021 alone. One of the features of ASFV infection is hemoadsorption (HAD), which has been linked to virulence, although the molecular and pathological basis of this hypothesis remains largely unknown. In this study, we have analyzed and identified the key players responsible of HAD, contributing to the identification of new determinants of ASFV virulence, the understanding of ASFV pathogenesis, and the rational development of new vaccines.

A comparative study on clinical and serological characteristics between patients with rhupus and those with systemic lupus erythematosus and rheumatoid arthritis.

BACKGROUND: The concomitant presence of two autoimmune diseases - systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA) - in the same patient is known as rhupus. We evaluated a group of patients with rhupus to clarify further their clinical, serological and immunogenic features in a multi-centre cohort. In addition, the study aimed to explore the utility of the 2019 European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) SLE classification criteria in our group of patients with rhupus. METHODS: This was a cross-sectional study. We included rhupus patients from 11 different rheumatology departments, and compared them to SLE and RA patients at a ratio of 2:1. All information was recorded following a pre-established protocol. RESULTS: A total of 200 patients were included: 40 rhupus patients and 80 each of SLE and RA patients as controls. Disease duration was similar among SLE and rhupus groups (around 13 years), but the RA group had a significantly lower disease duration. Main clinical manifestations were articular (94.2%), cutaneous (77.5%) and haematological (72.5%). Rhupus patients had articular manifestations similar to those expected in RA. Only 10% of rhupus patients had renal involvement compared with 25% of those with SLE (p < 0.05), while interstitial lung disease was more common in patients affected by RA. The 2019 EULAR/ACR SLE criteria were met in 92.5% of the rhupus patients and in 96.3% of the SLE cohort (p > 0.05). Excluding the joint domain, there were no differences between the numbers of patients who met the classification criteria. CONCLUSION: Rhupus patients follow a particular clinical course, with full expression of both SLE and RA in terms of organ involvement, except for a lower prevalence of kidney affection. The new 2019 EULAR/ACR SLE criteria are not useful for differentiating SLE and rhupus patients. A new way of classifying autoimmune diseases is needed to identify overlapping clusters.

Advanced Robotic Surgery of the Parapharyngeal Space: Transoral Robotic Styloidectomy in Eagle Syndrome.

Eagle syndrome (ES) is characterized by symptomatic elongation of the styloid process or ossification of the stylohyoid ligament causing irritation and inflammation of the trigeminal, facial, glossopharyngeal, and vagus nerves. The use of robotic surgery has been accepted as a first-line treatment for some head and neck squamous cell carcinomas but not for styloidectomy. The aim of this article is to document our experience with a transoral robotic approach to treat ES and to present the outcomes of 6 patients.The author present the transoral robotic surgery as a successful alternative for the surgical management of ES. Our experience with this approach has been excellent, granting an optimal vision of the surgical field with the consequent safe manipulation of the instruments avoiding injuries to healthy tissue.

Molecular epidemiology and resistance profiles of Clostridium difficile in a tertiary care hospital in Spain.

Epidemiological surveillance of Clostridium difficile infection has gained importance in recent years as a result of the rapid spread of epidemic strains, including hypervirulent strains and strains with reduced susceptibility to antimicrobials. The molecular epidemiology and antimicrobial susceptibility of C. difficile in the reference hospital of the Balearic Islands (Spain) is reported in this study. One hundred isolates of toxigenic C. difficile from different patients were selected using rapid dual EIA screening test. All isolates were characterized through toxin profile, PCR ribotyping and, in addition, multi-locus sequence typing (MLST) was performed on fifty selected strains. MICs to metronidazole, vancomycin, erythromycin and moxifloxacin were also determined. A total of 43 different ribotypes were distinguished, with higher prevalence of ribotype 014 (34%). Twenty one per cent of the isolates expressed binary toxin and it is noteworthy that 62% of these were identified as the hypervirulent ribotype 078, the second most prevalent ribotype found in our hospital (13%). A total of 20 different sequence types (STs) were found, including a new described allele and ST. MLST data showed a clear concordance between some ribotypes and STs, mainly represented by ribotype 014/ST-2, ribotype 078/ST-11 and ribotype 001/ST-3. Phylogenetic analysis also revealed that most of the isolates were genetically related, forming a large clonal complex. Finally, ribotypes 078 (ST-11) and 001 (ST-3) were associated with higher resistance to erythromycin and to erythromycin and moxifloxacin, respectively. All these data suggest that the combination of ribotyping and MLST is a good tool for the surveillance of the changing epidemiology of C. difficile. A wide dissemination of clones has been observed in our setting, ribotype 014 (ST-2) being the most prevalent followed by the hypervirulent ribotype 078 (ST-11) and ribotype 001 (ST-3), their spread in our setting probably influenced by their higher resistance.

African swine fever virus ubiquitin-conjugating enzyme pI215L inhibits IFN-I signaling pathway through STAT2 degradation.

African swine fever virus (ASFV) is the causative agent of one of the most lethal diseases affecting domestic pig and wild boar, which is endangering the swine industry due to its rapid expansion. ASFV has developed different mechanisms to evade the host immune response, including inhibition of type I IFN (IFN-I) production and signaling, since IFN-I is a key element in the cellular antiviral response. Here, we report a novel mechanism of evasion of the IFN-I signaling pathway carried out by the ASFV ubiquitin-conjugating enzyme pI215L. Our data showed that pI215L inhibited IFN-stimulated response element (ISRE) activity and the consecutive mRNA induction of the IFN-stimulated genes ISG15 and IFIT1 through the ubiquitination and proteasomal degradation of STAT2. Additionally, by immunofluorescence, co-immunoprecipitation and nucleus-cytoplasm fractionation approaches, we have confirmed the interaction and colocalization of STAT2 and pI215L, in ectopic experiments and during ASFV infection. Moreover, expression of the catalytic mutant (I215L-C85A) did not inhibit the induction of ISG15 and IFIT1, nor the activity of ISRE. Furthermore, we confirmed that STAT2 degradation by pI215L is dependent on its catalytic activity, since expression of the pI215L-C85A mutant did not affect STAT2 levels, compared to the wild-type protein. Yet, our data reveal that the interaction of pI215L with STAT2 does not require the integrity of its catalytic domain since the pI215L-C85A mutant co-immunoprecipitates with STAT2. All these findings reveal, for the first time, the involvement of E2-ubiquitin-conjugating enzyme activity of pI215L in the immune response modulation.

Recombinant African Swine Fever Virus Arm/07/CBM/c2 Lacking CD2v and A238L Is Attenuated and Protects Pigs against Virulent Korean Paju Strain.

African swine fever (ASF) is an obligated declaration swine disease, provoking farm isolation measures and the closing of affected country boarders. ASF virus (ASFV) is currently the cause of a pandemic across China and Eurasia. By the end of 2019, ASF was detected in nine EU Member States: Bulgaria, Romania, Slovakia, Estonia, Hungary, Latvia, Lithuania, Poland and Belgium. The affected area of the EU extended progressively, moving mostly in a southwestern direction (EFSA). Inactivated and/or subunit vaccines have proven to fail since certain virus replication is needed for protection. LAVs are thus the most realistic option, which must be safe, effective and industrially scalable. We here generated a vaccine prototype from the Arm/07/CBM/c2 genotype II strain, in which we have deleted the EP402R (CD2v) and A238L genes by CRISPR/Cas9 in COS-1 cells, without detectable further genetic changes. The successful immunization of pigs has proven this vaccine to be safe and fully protective against the circulating Korean Paju genotype II strain, opening the possibility of a new vaccine on the market in the near future.

Wide dispersion of ST175 clone despite high genetic diversity of carbapenem-nonsusceptible Pseudomonas aeruginosa clinical strains in 16 Spanish hospitals.

During the COMParative Activity of Carbapenems Testing (COMPACT) surveillance study, 448 Pseudomonas aeruginosa clinical isolates were obtained from 16 Spanish hospitals. Nonsusceptibility (EUCAST breakpoints) to imipenem (35%), meropenem (33%), and/or doripenem (33%) was observed with 175 isolates (39%). Simultaneous resistance to these three drugs was observed with 126 of the 175 isolates (72%). Except for colistin, high resistance rates were observed among noncarbapenem antibiotics. Clonal relatedness was investigated by pulsed-field gel electrophoresis (PFGE) with SpeI, discriminating 68 patterns. Multilocus sequence typing (MLST) was performed on 84 isolates representing different PFGE types and all participating hospitals. Thirty-nine sequence types (STs) could be distinguished, and of these, ST175 (48 isolates, 10 hospitals), ST646 (16 isolates, 4 hospitals), ST532 (13 isolates, 3 hospitals), and ST111 (13 isolates, 7 hospitals) were the most frequently encountered. Minimum-spanning tree analysis confirmed a wide dissemination of different clones among participant hospitals, particularly ST175. PFGE pattern comparison within the four most frequent STs revealed that ST175 isolates were relatively uniform, while ST646, ST532, and ST111 isolates were highly diverse, with almost every isolate belonging to a unique pulsotype, even when originating from the same center. The population of carbapenem-nonsusceptible P. aeruginosa isolates from 16 hospitals is highly diverse, with one ST (ST175) representing a highly conserved clone disseminated in 10 of the 16 participant hospitals. This ST175 clone should be added to the list of P. aeruginosa clones at high risk for epidemic spread, such as the Liverpool, Manchester, and Melbourne clones previously found in cystic fibrosis patients and ST235 in the nosocomial setting.

Pseudomonas aeruginosa carbapenem resistance mechanisms in Spain: impact on the activity of imipenem, meropenem and doripenem.

OBJECTIVES: To investigate the mechanisms of carbapenem resistance in the 175 Pseudomonas aeruginosa isolates (39%; 175/448) showing non-susceptibility (European Committee on Antimicrobial Susceptibility Testing breakpoints) to imipenem (35%), meropenem (33%) and/or doripenem (33%) recovered in 2008-09 from 16 Spanish hospitals during the Comparative Activity of Carbapenem Testing (COMPACT) surveillance study. METHODS: MICs (Etest), clonal relatedness (PFGE) and metallo-ß-lactamase (MBL) production (Etest-MBL, PCR and sequencing) were determined. Mutation-driven resistance was studied in 60 non-MBL producers according to the doripenem MICs (15 isolates from each of four MIC groups: ≤ 1, 2-4, 8-16 and ≥ 32 mg/L). The expression of ampC, mexB, mexY, mexD and mexF was determined by real-time reverse transcription-PCR and the presence of mutations in oprD by PCR and sequencing. Isogenic mutants expressing combinations of mutation-driven carbapenem resistance were constructed. RESULTS: Twelve (6.9%) isolates were MBL (VIM-20, VIM-2 or VIM-13) producers and all showed high-level resistance (MIC 32 mg/L) to all three carbapenems. Regarding mutation-driven resistance, all but 1 of the 60 isolates were non-susceptible (MIC >32 mg/L) to imipenem, linked to oprD inactivation. In addition, 50% of the isolates overexpressed ampC, 33% mexY, 32% mexB and 15% mexF, while none overexpressed mexD. Increasing prevalence of ampC overexpression correlated with increasing doripenem MICs (≤ 1, 13%; 2-4, 53%; 8-16, 60%; and ≥ 32, 73%) while overexpression of efflux pumps correlated only with moderate resistance. Doripenem showed slightly higher activity than meropenem against isolates overexpressing ampC, especially mexB or mexY. The analysis of a collection of isogenic laboratory mutants supported this finding. CONCLUSIONS: Although the prevalence of MBL producers is increasing, mutation-driven resistance is still more frequent in Spain. Imipenem resistance was driven by OprD inactivation, while additional AmpC and particularly efflux pump hyperproduction had a lower impact on the activity of doripenem compared with meropenem.

African Swine Fever Virus Induces STAT1 and STAT2 Degradation to Counteract IFN-I Signaling.

African swine fever virus (ASFV) causes a serious disease in domestic pigs and wild boars and is currently expanding worldwide. No safe and efficacious vaccines against ASFV are available, which threats the swine industry worldwide. African swine fever virus (ASFV) is a complex dsDNA virus that displays multiple mechanisms to counteract the host innate immune response, whose efficacy might determine the different degrees of virulence displayed by attenuated and virulent ASFV strains. Here we report that infection with both virulent Arm/07/CBM/c2 and attenuated NH/P68 strains prevents interferon-stimulated gene (ISG) expression in interferon (IFN)-treated cells by counteracting the JAK/STAT pathway. This inhibition results in an impaired nuclear translocation of the interferon-stimulated gene factor 3 (ISGF3) complex, as well as in the proteasome-dependent STAT2 degradation and caspase 3-dependent STAT1 cleavage. The existence of two independent mechanisms of control of the JAK/STAT pathway, suggests the importance of preventing this pathway for successful viral replication. As ASFV virulence is likely associated with the efficacy of the IFN signaling inhibitory mechanisms, a better understanding of these IFN antagonistic properties may lead to new strategies to control this devastating pig disease.

A Genomic Snapshot of the SARS-CoV-2 Pandemic in the Balearic Islands.

Objective: To analyze the SARS-CoV-2 genomic epidemiology in the Balearic Islands, a unique setting in which the course of the pandemic has been influenced by a complex interplay between insularity, severe social restrictions and tourism travels. Methods: Since the onset of the pandemic, more than 2,700 SARS-CoV-2 positive respiratory samples have been randomly selected and sequenced in the Balearic Islands. Genetic diversity of circulating variants was assessed by lineage assignment of consensus whole genome sequences with PANGOLIN and investigation of additional spike mutations. Results: Consensus sequences were assigned to 46 different PANGO lineages and 75% of genomes were classified within a VOC, VUI, or VUM variant according to the WHO definitions. Highest genetic diversity was documented in the island of Majorca (42 different lineages detected). Globally, lineages B.1.1.7 and B.1.617.2/AY.X were identified as the 2 major lineages circulating in the Balearic Islands during the pandemic, distantly followed by lineages B.1.177/B.1.177.X. However, in Ibiza/Formentera lineage distribution was slightly different and lineage B.1.221 was the third most prevalent. Temporal distribution analysis showed that B.1 and B.1.5 lineages dominated the first epidemic wave, lineage B.1.177 dominated the second and third, and lineage B.1.617.2 the fourth. Of note, lineage B.1.1.7 became the most prevalent circulating lineage during first half of 2021; however, it was not associated with an increased in COVID-19 cases likely due to severe social restrictions and limited travels. Additional spike mutations were rarely documented with the exception of mutation S:Q613H which has been detected in several genomes (n = 25) since July 2021. Conclusion: Virus evolution, mainly driven by the acquisition and selection of spike substitutions conferring biological advantages, social restrictions, and size population are apparently key factors for explaining the epidemic patterns registered in the Balearic Islands.

Anti-biofilm and resistance suppression activities of CXA-101 against chronic respiratory infection phenotypes of Pseudomonas aeruginosa strain PAO1.

OBJECTIVES: Biofilm growth, mucoid phenotype and proficient resistance development by hypermutable strains dramatically limit the efficacy of current therapies for Pseudomonas aeruginosa chronic respiratory infection (CRI) in cystic fibrosis (CF) patients. We evaluated the activity of the new cephalosporin CXA-101, ceftazidime, meropenem and ciprofloxacin against biofilms of wild-type PAO1 and its mucoid (mucA), hypermutable (mutS) and mucoid-hypermutable derivatives, and analysed the capacity of these strains to develop resistance during planktonic and biofilm growth. METHODS: MICs and MBCs were determined by microdilution, and mutant frequencies were determined at 4x and 16x the MICs. Biofilms were formed using a modified Calgary device and were incubated for 24 h with 0x, 1x, 4x or 16x the MIC of each antibiotic. Biofilms were plated, and total cells and resistant mutants enumerated. RESULTS: CXA-101 showed concentration-independent biofilm bactericidal activity, being the most potent agent tested at 1x the MIC for wild-type, mucoid and hypermutable strains. The spontaneous mutant frequencies for CXA-101 were extremely low (<5 x 10(-11)), even for the hypermutable strain at low concentrations (4x the MIC), in sharp contrast to the other antipseudomonal agents. Accordingly, mutants resistant to 4x the MIC of CXA-101 did not emerge in biofilms for any of the strains/concentrations tested. CONCLUSION: These data strongly suggest that resistance to CXA-101 (at least 4x the MIC) cannot be driven by single-step mutations, either in planktonic or in biofilm growth. CXA-101 shows encouraging properties for the treatment of CRI by P. aeruginosa, which need to be further evaluated in animal models and pertinent clinical trials.

Efficacy of particle repositioning manoeuvres in benign positional paroxysmal vertigo: A revision of 176 cases treated in a tertiary care centre. / Eficacia de las maniobras de reposicionamiento canalicular en el vértigo posicional paroxístico benigno: revisión de 176 casos tratados en un centro hospitalario de tercer nivel.

INTRODUCTION AND OBJECTIVES: Benign paroxysmal positional vertigo is the most common peripheral vertigo disease. The aim of this paper is to review the results obtained with the different specific particle repositioning manoeuvres, evaluating the possible risk factors linked to a poorer prognosis. METHODS: One hundred and seventy-six patients with a diagnosis of benign paroxysmal positional vertigo were reviewed retrospectively, of whom 150 had vertigo of the posterior canal, 20 had vertigo of the horizontal canal, 3 had vertigo of the superior canal, and 3 had a double vertigo. The Epley manoeuvre was used to treat the posterior and superior canals, and Lempert manoeuvre was used to treat the horizontal canal. An imaging study by nuclear magnetic resonance with gadolin was always used in refractory cases. RESULTS: The Epley manoeuvre showed an efficacy of 74.6 and 100% at first attempt for posterior and superior canals respectively. The efficacy of the Lempert manoeuvre for the horizontal canal was 72.72% in the patients with canalolithiasis, and 58.33% in the patients with cupulolithiasis. The treatment of patients with more than one affected canal and a history of surgery in the previous month was more difficult. CONCLUSIONS: Particle repositioning manoeuvres show a very high success rate, allowing better results in the treatment of the posterior canal. We need more studies to confirm the suspicion that surgery may be a factor of poorer prognosis.

[Osteoporosis as a first manifestation of systemic mastocytosis. Study of 6 cases]. / Osteoporosis como primera manifestación de una mastocitosis sistémica. Estudio de 6 casos.

BACKGROUND AND OBJECTIVE: We describe 6 cases of secondary osteoporosis due to systemic mastocytosis diagnosed in the last 6 years. RESULTS: Three females and 3 males, age range: 47-66 years, diagnosed with osteoporosis were subsequently diagnosed with systemic mastocytosis. Diagnosis delay: 0.5-17 years. Cutaneous involvement was present in 3 patients, hematologic involvement in 2 patients and gastrointestinal involvement in 2 patients. Histamine levels in urine were elevated in all cases. Four patients had fractures. Treatment with bisphosphonates was started. After 3 years the values of bone mineral density (BMD) improved in the 5 patients evaluated. Two patients had new vertebral fractures and started teriparatide. CONCLUSIONS: Osteoporosis is an unfrequent initial manifestation of systemic mastocytosis. These patients have a high risk of fractures. Our results suggest that although bisphosphonates improve the bone mineral density the risk of fractures persists.

Phenotyping and susceptibility of established porcine cells lines to African Swine Fever Virus infection and viral production.

African swine fever virus (ASFV) is a highly pathogenic, double-stranded DNA virus with a marked tropism for cells of the monocyte-macrophage lineage, affecting swine species and provoking severe economic losses and health threats. In the present study, four established porcine cell lines, IPAM-WT, IPAM-CD163, C∆2+ and WSL, were compared to porcine alveolar macrophage (PAM) in terms of surface marker phenotype, susceptibility to ASFV infection and virus production. The virulent ASFV Armenia/07, E70 or the naturally attenuated NHV/P68 strains were used as viral models. Cells expressed only low levels of specific receptors linked to the monocyte/macrophage lineage, with low levels of infection overall, with the exception of WSL, which showed more efficient production of strain NHV/P68 but not of strains E70 and Armenia/07.

The SAPHO syndrome: a clinical and imaging study.

The purpose of this study is to describe the clinical and radiological manifestations of patients with the synovitis, acne, pustulosis, hyperostosis, and osteitis (SAPHO) syndrome. Retrospective study (1984-2007) was performed in a single center. All patients with the SAPHO syndrome were included. Fifty-two patients were included: 26 male, mean age at diagnosis is 42±12 years. Ostearticular involvement was present before cutaneous involvement in 59.6% of patients and concomitantly in 23.5%. Anterior chest pain was the commonest clinical manifestation, it was present in 38 patients (73%), followed by peripheral arthritis in 17 patients (32%), and sacroliliac pain in 14 patients (26.9%). Cutaneous involvement was present in 33 patients (63.5%). HLA B27 antigen was present in eight patients (17.7%). Bone scintigraphy showed an increased uptake in 42 patients (93.3%). The location of the uptake was mainly in sternoclavicular and manubriosternal joints. CT scan was performed in all "hot joints" showing sclerosis, erosions, hyperostosis, and soft tissue involvement. Refractory patients were treated mainly with pamidronate. Although SAPHO syndrome is an entity that share features that fit into a variety of established disease categories, the present study has a homogenous clinical and radiological pattern that gives support to believe that the SAPHO syndrome is an isolated clinical entity.

Long-term TNF-alpha blockade in patients with amyloid A amyloidosis complicating rheumatic diseases.

OBJECTIVE: To evaluate the effectiveness and safety of anti-tumor necrosis factor therapy in patients with amyloid A amyloidosis. METHODS: Multicenter, controlled, dynamic prospective cohort study of 36 patients with amyloid A amyloidosis (94% kidney involvement) treated with anti-tumor necrosis factor agents (drug exposure of 102.97 patient-years). As an external control group, 35 propensity score-matched non-amyloid patients were chosen from the Base de Datos de Productos Biológicos de la Sociedad Española de Reumatología registry. The end points were kidney response and progression, anti-tumor necrosis factor continuation rate, patient survival, and adverse events. RESULTS: At the end of follow-up, a kidney response was observed in 12 of 22 patients (54.5%) and a kidney progression was observed in 6 of 36 patients (17%). The kidney amyloidosis remained stable in 16 of 36 patients (44%). The level of acute phase reactants diminished but did not reach the normal level. The continuation rates of anti-tumor necrosis factor drugs among patients with amyloid A amyloidosis after 1, 2, 3, and 4 or more years were 80%, 80%, 61%, and 52%, respectively, comparable to controls. The 5-year cumulative survival of amyloid A amyloidosis cases was 90.6%, and the 10-year survival was 78.5%. In a multivariate Cox regression analysis, the duration of amyloidosis and the level of proteinuria at the onset of anti-tumor necrosis factor treatment were independent predictors of treatment failure, whereas the level of proteinuria was the only factor that predicts mortality. Most adverse events were similar in both groups, although the number of infections was 3 times higher in amyloid A amyloidosis cases. CONCLUSION: Anti-tumor necrosis factor drugs are effective in treating amyloid A amyloidosis, although they might increase the risk of infection.

[Septic pseudopodagra by Streptococcus agalactiae]. / Seudopodagra séptica por Streptococcus agalactiae.

Pseudopodagra is an unusual cause of first metatarsophalangeal arthritis. There are multiple causes, and an infectious cause always has to be excluded. We report a septic pseudopodagra by Streptococcus agalactiae in a patient with chronic hepatopathy with an indolent evolution and a consequent delay in diagnosis. Antibiotic treatment was installed with a favourable outcome without functional sequelae. The pseudopodagra reports in the bibliography are reviewed with special attention on those of infectious aetiology.