Search results for "superinfection"
showing 10 items of 14 documents
Simultaneous infection of cattle with different Anaplasma phagocytophilum variants.
2019
Anaplasma phagocytophilum is a tick-transmitted Gram-negative obligate intracellular bacterium that replicates in neutrophil granulocytes. It causes tick-borne fever in cattle and sheep. We report here the case of a 5-year-old cow from Germany with clinically overt granulocytic anaplasmosis presenting with fever, lower limb oedema and drop in milk-yield. The herd encompassed 10 animals, 8 other animals showed subclinical infection. The strains from the 9 A. phagocytophilum positive cows were molecularly characterized using ankA gene-based and multilocus sequence typing (MLST). Seven of 9 (78%) animals were infected simultaneously with different ankA variants belonging to ankA clusters I and…
Hydroxyurea‑induced superinfected ulcerations: Two case reports and review of the literature
2020
The chronic use of hydroxyurea (HU) in some oncologic and non-oncologic diseases (psoriasis, sickle cell anemia) can be accompanied by side effects, both systemic and mucocutaneous. The most severe adverse events known in HU therapy are leg ulcers and cutaneous carcinomas. At skin level may also appear: xerosis, persistent pruritus, skin color changes (erythema, hyperpigmentation), cutaneous atrophy. Likewise, oral ulcerations and stomatitis may occur at mucosal level. Hair damage can be expressed through alopecia and nail damage through melanonychia and oncycholysis. First case, a 63-year-old woman with severe psoriasis vulgaris and chronic granulocytic leukemia, with 5 years of HU therapy…
The Management of Staphylococcal Toxic Shock Syndrome. A Case Report
2016
Abstract Staphylococcal toxic shock syndrome (TSS) is most frequently produced by TSS toxin-1 (TSST-1) and Staphylococcal enterotoxin B (SEB), and only rarely by enterotoxins A, C, D, E, and H. Various clinical pictures can occur depending on severity, patient age and immune status of the host. Severe forms, complicated by sepsis, are associated with a death rate of 50-60%. The case of a Caucasian female infant, aged seven weeks, hospitalized with a diffuse skin rash, characterized as allergodermia, who initially developed TSS with axillary intertrigo, is reported. TSS was confirmed according to 2011 CDC criteria, and blood cultures positive for Methicillin-sensitive Staphylococcus aureus (…
Smouldering hepatitis B virus replication in patients with chronic liver disease and hepatitis delta virus superinfection
1991
Hepatitis B virus deoxyribonucleic acid (HBV-DNA) was studied by Southern blot analysis in liver biopsy specimens from 75 HBsAg-positive patients with chronic liver disease living in southern Italy. Twenty-seven of the patients were hepatitis delta virus (HDV) superinfected. Intrahepatic HBV-DNA was detected in 54 (72%) patients, 32 (59%) of them with replicative forms. The presence of replicative forms was directly related to liver HBcAg and inversely related to liver HDAg, as shown by multivariate analysis. However, 14 patients with intrahepatic HBV-DNA non-replicative pattern and about half of HDV-infected patients were liver HBcAg and/or serum HBV-DNA positive, mostly in low amounts. Hi…
Genetic Diversity of HIV-1 Non-B Strains in Sicily: Evidence of Intersubtype Recombinants by Sequence Analysis ofgag,pol, andenvGenes
2007
The molecular epidemiology of HIV-1 strains in Sicily (Italy) was phylogenetically investigated by the analysis of HIV-1 gag, pol, and env gene sequences from 11 HIV-1 non-B strains from 408 HIV-1-seropositive patients observed from September 2001 to August 2006. Sequences suggestive of recombination were further investigated by bootscanning analysis of various fragments. Overall, we identified several second-generation recombinant (SGRs) strains, which contained genetic material of CRF02_AG in at least one gene. Notably, three individuals were found to be infected with subsubtype A3, and one of them showed genetic recombination with subsubtype A4. The current study emphasizes the genetic a…
Anti-hepatitis A virus seroprevalence and seroconversion in a cohort of patients with chronic viral hepatitis
2002
Abstract Background. Patients with chronic hepatitis C infected by hepatitis A virus have a substantial risk of fulminant hepatitis or death, while the course of hepatitis A virus is uncomplicated in most subjects with chronic hepatitis B. Aim. To evaluate the prevalence of anti-hepatitis A virus antibodies and the incidence of hepatitis A virus seroconversion in a nationwide sample of 530 patients with chronic hepatitis B and/or hepatitis C infection initially susceptible to this infection after a follow-up of some years. Results. The overall anti-hepatitis A virus prevalence was 85.7%, with no difference between males and females. By the age of 50 years, almost all patients were found to …
An investigation on the relationship between the occurrence of CMV DNAemia and the development of invasive aspergillosis in the allogeneic stem cell …
2013
Cytomegalovirus (CMV) infection might increase the risk of fungal superinfection in allogeneic stem cell transplant patients. The potential association between the occurrence of CMV DNAemia and the development of invasive aspergillosis in this clinical setting was investigated. The current retrospective observational study included 167 patients undergoing T cell-replete allogeneic stem cell transplantation. Virological monitoring of active CMV infection was performed by the pp65 antigenemia assay and/or by a plasma real-time PCR assay. A total of 109 out of 167 patients developed CMV DNAemia. Twenty-three patients had proven (n = 4) or probable (n = 19) invasive aspergillosis. The occurrenc…
Multiple infection dynamics has pronounced effects on the fitness of RNA viruses
2001
Several factors play a role during the replication and transmission of RNA viruses. First, as a consequence of their enormous mutation rate, complex mixtures of genomes are generated immediately after infection of a new host. Secondly, differences in growth and competition rates drive the selection of certain genetic variants within an infected host. Thirdly, but not less important, a random sampling occurs at the moment of viral infectious passage from an infected to a healthy host. In addition, the availability of hosts also influences the fate of a given viral genotype. When new hosts are scarce, different viral genotypes might infect the same host, adding an extra complexity to the comp…
Recombination in Hepatitis C Virus
2011
Hepatitis C virus (HCV) is a Flavivirus with a positive-sense, single-stranded RNA genome of about 9,600 nucleotides. It is a major cause of liver disease, infecting almost 200 million people all over the world. Similarly to most RNA viruses, HCV displays very high levels of genetic diversity which have been used to differentiate six major genotypes and about 80 subtypes. Although the different genotypes and subtypes share basic biological and pathogenic features they differ in clinical outcomes, response to treatment and epidemiology. The first HCV recombinant strain, in which different genome segments derived from parentals of different genotypes, was described in St. Petersburg (Russia) …
The effect of co- and superinfection on the adaptive dynamics of vesicular stomatitis virus
2006
In many infectious diseases, hosts are often simultaneously infected with several genotypes of the same pathogen. Much theoretical work has been done on modelling multiple infection dynamics, but empirical evidences are relatively scarce. Previous studies have demonstrated that coinfection allows faster adaptation than single infection in RNA viruses. Here, we use experimental populations of the vesicular stomatitis Indiana virus derived from an infectious cDNA, to show that superinfection dynamics promotes faster adaptation than single infection. In addition, we have analysed two different periodicities of multiple infection, daily and separated 5 days in time. Daily multiple infections al…