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Cervicofacial nocardiosis in an immunocompetent child.

UNLABELLED: Nocardiosis occurs primarily as an opportunistic infection in an immunocompromised host. The infection may on rare occasion occur in a normal host confounding the diagnosis. It is also notably an uncommon infection in children. We report a 1-y-old girl with cervicofacial nocardial infection who presented with acute suppurative otitis media and lymphadenitis. This child did not have any predisposing risk factors for this infection and responded well to treatment with co-trimoxazole and chloramphenicol. She is doing well on follow-up. CONCLUSION: Nocardiosis in an immunocompetent sm…

A Stroll Through the History of Monoxenous Trypanosomatids Infection in Vertebrate Hosts.

The Trypanosomatidae family encompasses unicellular flagellates and obligate parasites of invertebrates, vertebrates, and plants. Trypanosomatids are traditionally divided into heteroxenous, characterized by the alternation of the life cycle between an insect vector and a plant or a vertebrate host, including humans being responsible for severe diseases; and monoxenous, which are presumably unique parasites of invertebrate hosts. Interestingly, studies reporting the occurrence of these monoxenous trypanosomatids in humans have been gradually increasing, either associated with Leishmania co-inf

Usual Presentation Of An Unusual Pathogen - Cryptococcus Laurentii Meningitis: A Case Report.

Infections caused by non-neoformans Cryptococcus spp., including Cryptococcus laurentii, previously thought to be saprophyte and non-pathogenic, have become more common during the past few years, particularly in immunocompromised hosts. To the best of our knowledge here, we present the first case of meningitis in an immunocompromised patient due to a fungus that has never been reported in Pakistan. Our patient, a 40-year old male, who had acquired immunodeficiency syndrome (AIDS) was diagnosed as Cryptococcus laurentti meningitis, with a rare neurological manifestation i.e., cryptococcomas and…

Chronic enteroviral meningoencephalitis in a patient on rituximab for the treatment of psoriatic arthritis: A case report and brief literature review.

Enteroviruses are RNA viruses within the Picornaviridae family. Enteroviruses derive their name from the way they are typically transmitted … eroviral infection. This case adds to the present body of knowledge about enteroviral infections in immunocompromised hosts.

Impact of immune status on the clinical characteristics and treatment outcomes of nocardiosis.

Nocardiosis occurs in both immunocompromised and immunocompetent patients. We aimed to assess how its characteristics differ depending on pa … that pulmonary cavitation (47% vs. 8%) and coexisting infections (17% vs. 0%) were more frequent in immunocompromised hosts. Nocardia farcinica, the most commonly identified isolates at the species level (51%), was highly susceptible to trimethoprim-sulfamethoxazole (100%) and highly resistant to ceftriaxone (94%). Nocardiosis should be considered in differential diagno …

Infection prevention in sarcoidosis: proposal for vaccination and prophylactic therapy.

Sarcoidosis is a systemic inflammatory disease characterized by granuloma formation in affected organs and caused by dysregulated immune response to an unknown antigen. Sarcoidosis patients receiving immunosuppressive medications are at increased risk of infection. Lymphopenia is also commonly seen among patient with sarcoidosis. In this review, risk of infections, including opportunistic infections, will be outlined. Recommendations for vaccinations and prophylactic therapy based on literature review will also be summarized. (Sarcoidosis Vasc Diffuse Lung Dis 2020; 37 (2): 87-98).

How to invade a susceptible host: cellular aspects of aspergillosis.

Diseases caused by Aspergillus spp. and in particular A. fumigatus are manifold and affect individuals suffering from immune dysfunctions, among them immunocompromised ones. The determinants of whether the encounter of a susceptible host with infectious propagules of this filamentous saprobe results in infection have been characterized to a limited extent. Several cellular characteristics of A. fumigatus that have evolved in its natural environment contribute to its virulence, among them general traits as well as particular ones that affect interaction with the mammalian host. Among the latter

Molecular mechanisms of cryptococcal meningitis.

BACKGROUND: Nutritional status is a critical indicator of overall health in individuals suffering from malignant tumours, reflecting the complex interplay of various contributing factors. This research focused on identifying and analysing the factors influencing malnutrition among older patients aged ≥65 with malignant tumours and aimed to develop a comprehensive risk model for predicting malnutrition. METHODS: This study conducted a retrospective analysis of clinical data from 3,387 older inpatients aged ≥65 years with malignant tumours collected at our hospital from July 1, 2021, to Decembe

Covariance in species diversity and facilitation among non-interactive parasite taxa: all against the host.

Different parasite taxa exploit different host resources and are often unlikely to interact directly. It is unclear, however, whether the diversity of any given parasite taxon is indirectly influenced by that of other parasite taxa on the same host. Some components of host immune defences may operate simultaneously against all kinds of parasites, whereas investment by the host in specific defences against one type of parasite may come at the expense of defence against other parasites. We investigated the relationships between the species diversity of 4 higher taxa of ectoparasites (fleas, suck

Fatal disseminated toxoplasmosis in a feline immunodeficiency virus-positive cat receiving oclacitinib for feline atopic skin syndrome.

Toxoplasma gondii is a ubiquitous protozoan, for which felids are the definitive host. Immunocompromised individuals are susceptible to recrudescent toxoplasmosis. This case describes a 6-year-old, feline immunodeficiency virus-positive domestic short hair cat with feline atopic skin syndrome that developed fatal toxoplasmosis after treatment with oclacitinib for five months.

Pneumocystis jirovecii Disease: Basis for the Revised EORTC/MSGERC Invasive Fungal Disease Definitions in Individuals Without Human Immunodeficiency Virus.

BACKGROUND: Pneumocystis jirovecii pneumonia (PCP) causes substantive morbidity in immunocompromised patients. The EORTC/MSGERC convened an expert group to elaborate consensus definitions for Pneumocystis disease for the purpose of interventional clinical trials and epidemiological studies and evaluation of diagnostic tests. METHODS: Definitions were based on the triad of host factors, clinical-radiologic features, and mycologic tests with categorization into probable and proven Pneumocystis disease, and to be applicable to immunocompromised adults and children without human immunodeficiency

Mycobacterium tuberculosis and Mycobacterium fortuitum osteomyelitis of the foot and septic arthritis of the ankle in an immunocompetent patient.

Mycobacteria, both tuberculous and nontuberculous, are recognized as a cause of chronic bone and joint infection. However, the diagnosis of mycobacterial infection is easily missed because of the absence of systemic involvement. Moreover, specific microbiologic techniques are required to detect mycobacteria in clinical specimens. Infections due to uncommon pathogens such as mycobacteria are more likely to occur in the immunocompromised host. A case of septic arthritis of the ankle and osteomyelitis of the foot due to both tuberculous and nontuberculous mycobacteria in an immunocompetent host i…

Safety and tolerability study of sotrovimab (VIR-7831) prophylaxis against COVID-19 infection in immunocompromised individuals with impaired SARS-CoV-2 humoral immunity.

BackgroundMultiple vaccines have been approved since August 2021 to prevent infection with SARS-CoV-2; however, 20-40% of immunocompromised people fail to develop SARS-CoV-2 spike antibodies after COVID-19 vaccination and remain at high risk of infection and more severe illness than non-immunocompromised hosts. Sotrovimab (VIR-7831) is a monoclonal neutralizing antibody that binds a conserved epitope on the SARS-CoV-2 spike protein. It is neither renally excreted nor metabolized by P450 enzymes and therefore unlikely to interact with concomitant medications (e.g., immunosuppressive medications…

Staphylococcus aureus: a continuing problem.

Caution is required in managing any immunocompromised host, not only because these patients will be carriers, but because they are also very susceptible to infections with S. aureus. These hosts are not candidates for short-course antibiotic therapy, and catheters should be removed when S. aureus bacteremia is diagnosed. The S. aureus cell wall is a major determinant of the host response and the pathogenicity of this organism. The clinician should recognize the three most important toxins produced by S. aureus: exfoliatin, TSST-1, and enterotoxin-B. Toxic shock syndrome can occur in any host, …

Pneumocystis carinii, Toxoplasma gondii, Cytomegalovirus and the compromised host.

Pneumocystis carinii and Toxoplasma gondii are the two major parasitic protozoan pathogens in the immunocompromised host. Both organisms cause latent infection in humans and many animals. Cats are the definitive hosts for toxoplasmosis; the animal vector for pneumocystis (if any) has not been defined. Toxoplasma is an obligate intracellular parasite, whereas the available evidence suggests that Pneumocystis carinii exists primarily extracellularly. In compromised hosts, pneumocystis infection usually involves only lungs, whereas toxoplasma causes a generalized infection with encephalitis being…

Aggressive Pasteurella multocida rhinosinusitis with orbital extension in a patient with liver cirrhosis: A case report and literature review.

Pasteurella multocida often causes skin and soft tissue infections associated with animal bites and scratches. However, aggressive respiratory tract infections without animal exposure have been reported in immunocompromised hosts. We report the case of a Japanese woman in her early 80 s with liver cirrhosis that developed acute rhinosinusitis caused by P. multocida without animal-related wounds. She presented with swelling and redness of the left eyelid, and subsequently developed decreased vision and impaired eye movement. Imaging studies revealed an ethmoid sinus abscess with a bony defect o…

The evolution of tecovirimat resistance in an immunocompromised individual with severe mpox infection.

Tecovirimat is widely used for severe mpox, but resistance is increasingly reported, particularly in immunocompromised hosts. We describe a case of persistent clade IIb mpox in a 43-year-old man with advanced HIV (CD4 23 cells/µL) and disseminated necrotising disease. Despite prolonged tecovirimat therapy, lesions progressed. Serial viral isolates (n=8) obtained over 45 days underwent phenotypic susceptibility testing and whole-genome sequencing. Tecovirimat susceptibility declined markedly, with a ∼3 log10 increase in IC50 in late isolates. Sequencing identified distinct resistance-associated…

Cryptococcal Meningoencephalitis in Phenotypically Normal Patients.

Cryptococcosis is an invasive fungal infection found worldwide that causes significant morbidity and mortality among a broad range of hosts. There are approximately 223,000 new cases of cryptococcosis annually throughout the world, and at least 180,000 deaths are attributed to this infection each year. Most of these are due to complications of cryptococcal meningoencephalitis among HIV-infected patients in resource-limited environments. The majority of individuals diagnosed with cryptococcosis have underlying conditions associated with immune dysfunction such as HIV, solid organ transplant, he

Increased viral variants in children and young adults with impaired humoral immunity and persistent SARS-CoV-2 infection: A consecutive case series.

BACKGROUND: There is increasing concern that persistent infection of SARS-CoV-2 within immunocompromised hosts could serve as a reservoir for mutation accumulation and subsequent emergence of novel strains with the potential to evade immune responses. METHODS: We describe three patients with acute lymphoblastic leukemia who were persistently positive for SARS-CoV-2 by real-time polymerase chain reaction. Viral viability from longitudinally-collected specimens was assessed. Whole-genome sequencing and serological studies were performed to measure viral evolution and evidence of immune escape. …

Расширяющийся спектр герпесвирусных инфекций нервной системы.

Герпесвирусы вызывают различные острые, субакулы и хронические расстройства центральной и периферической нервной систем у взрослых и детей. Могут быть затронуты как иммунокомпетентные, так и иммунокомпромиссные лица. Зостер (шинглы), являющийся результатом возобновления вируса варицелла-зостера (VZV), является наиболее частым неврологическим осложнением. К числу других неврологических осложнений относятся энцефалит, производимый вирусом герпеса I (HSV-1), и менее часто HSV-2, а также VZV и цитомегаловирусом (CMV). Острый менингит виден с VZV и HSV-2 и доброкачественным периодическим менингитом

Совпадение в аннотации оригинала
Herpesviruses cause various acute, subacute, and chronic disorders of the central (CNS) and peripheral (PNS) nervous systems in adults and c … d. HHV-6 produces childhood exanthem subitum (roseola) and febrile convulsions. Immunocompetent and immunocompromised hosts manifest different incidences and patterns of herpesvirus infections. For example, stroke due to VZV-mediated large vessel disease (herpes zoster ophthalmicus) occurs predominantly in immunocompetent hosts, while small vessel disease (leukoencephal …