keyword
MENU ▼
Read by QxMD icon Read
search

Acanthamoeba

keyword
https://www.readbyqxmd.com/read/29233457/antimicrobial-efficacy-of-a-novel-povidone-iodine-contact-lens-disinfection-system
#1
Katsuhide Yamasaki, Fumio Saito, Ritsue Ota, Simon Kilvington
PURPOSE: Contact lens (CL) wear is a risk factor for the acquisition of microbial keratitis. Accordingly, compliance to manufacturers' recommended hygiene and disinfection procedures are vital to safe (CL) use. In this study we evaluated a novel povidone-iodine (PI) (CL) disinfection system (cleadew, Ophtecs Corporation, Japan) against a range of bacterial, fungal and Acanthamoeba. METHODS: Antimicrobial assays were conducted according to ISO 14729 using the recommended strains of bacteria and fungi, with and without the presence of organic soil...
December 7, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29221710/acanthamoeba-keratitis-in-patients-wearing-scleral-contact-lenses
#2
Matheus Porto Sticca, Linda C Carrijo-Carvalho, Isa M B Silva, Luiz A Vieira, Luciene B Souza, Rubens Belfort Junior, Fábio Ramos S Carvalho, Denise Freitas
PURPOSE: To report a series of cases of Acanthamoeba keratitis (AK) in scleral lens wearers with keratoconus to determine whether this type of contact lens presents a greater risk for development of infection. METHODS: This study reports three patients who wore scleral contact lenses to correct keratoconus and developed AK. The diagnoses of AK were established based on cultures of the cornea, scleral contact lenses, and contact lens paraphernalia. This study investigated the risk factors for infections...
December 5, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29219900/diagnostic-challenges-in-nocardia-keratitis
#3
Joséphine Behaegel, Sorcha Ní Dhubhghaill, Carina Koppen
OBJECTIVE: To present a case of diagnostic confusion in Nocardia keratitis in a contact lens wearer and to illustrate the characteristic clinical findings of this rare entity. METHODS: Case report of Nocardia keratitis that was mistaken for acanthamoeba, herpetic, and fungal keratitis in three tertiary corneal referral centers before the correct diagnosis of Nocardia infection was made. RESULTS: A 29-year-old contact lens wearer was referred to our hospital for a contact lens-associated bacterial keratitis, not improving under standard bacterial treatment...
December 5, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/29218442/silver-nanoparticle-conjugation-affects-antiacanthamoebic-activities-of-amphotericin-b-nystatin-and-fluconazole
#4
Ayaz Anwar, Ruqaiyyah Siddiqui, Muhammad Asim Hussain, Dania Ahmed, Muhammad Raza Shah, Naveed Ahmed Khan
Infectious diseases are the leading cause of morbidity and mortality, killing more than 15 million people worldwide. This is despite our advances in antimicrobial chemotherapy and supportive care. Nanoparticles offer a promising technology to enhance drug efficacy and formation of effective vehicles for drug delivery. Here, we conjugated amphotericin B, nystatin (macrocyclic polyenes), and fluconazole (azole) with silver nanoparticles. Silver-conjugated drugs were synthesized successfully and characterized by ultraviolet-visible spectrophotometry, Fourier transform infrared spectroscopy, and atomic force microscopy...
December 7, 2017: Parasitology Research
https://www.readbyqxmd.com/read/29211242/potentially-pathogenic-acanthamoeba-genotype-t4-isolated-from-dental-units-and-emergency-combination-showers
#5
Esteban Castro-Artavia, Lissette Retana-Moreira, Jacob Lorenzo-Morales, Elizabeth Abrahams-Sandí
BACKGROUND: Acanthamoeba is the genus of free-living amoebae that is most frequently isolated in nature. To date, 20 Acanthamoeba genotypes have been described. Genotype T4 is responsible for approximately 90% of encephalitis and keratitis cases. Due to the ubiquitous presence of amoebae, isolation from environmental sources is not uncommon; to determine the clinical importance of an isolation, it is necessary to have evidence of the pathogenic potential of amoebae. OBJECTIVE: The aim of this study was to physiologically characterise 8 Acanthamoeba T4 isolates obtained from dental units and emergency combination showers and to determine their pathogenic potential by employing different laboratory techniques...
December 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29210829/in-vitro-evaluation-of-adhesion-of-two-acanthamoeba-strains-to-cosmetic-contact-lenses
#6
Berna B Bakay, Zubeyde A Polat
PURPOSE: To evaluate the factors affecting the adhesion of Acanthamoeba trophozoites to the surface of cosmetic contact lenses (CCLs). METHODS: Acanthamoeba castellanii and A. hatchetti trophozoites were inoculated onto CCLs (hema copolymer [HM] [38.5% H2O], phemfilcon [PF] [55% H2O], polymacon [PM] [38% H2O], polyhema [PH] [%42 H2O], and hema [HM55] [55% H2O]), and the number of trophozoites adhered to the lens surfaces was assessed over time, that is, at 15 min, 1, and 24 hr...
November 28, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/29203378/occurrence-of-acanthamoeba-genotypes-in-central-west-malaysian-environments
#7
Mohamad Hafiz Abdul Basher, Init Ithoi, Rohela Mahmud, Awatif Mohamed Abdulsalam, Agus Iwan Foead, Salwa Dawaki, Wahib Mohammed Mohsen Atroosh, Veeranoot Nissapatorn, Wan Omar Abdullah
Acanthamoeba species are ubiquitous free-living protozoa that can be found worldwide. Occasionally, it can become parasitic and the causative agent of acanthamoebic keratitis (AK) and Granulomatous Amoebic Encephalitis (GAE) in man. A total of 160 environmental samples and 225 naturally-infected animal corneal swabs were collected for Acanthamoeba cultivation. Acanthamoeba was found to be high in samples collected from environments (85%, 136/160) compared to infected animal corneas (24.89%, 56/225) by microscopic examination...
December 1, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29177581/an-apparent-acanthamoeba-genotype-is-the-product-of-a-chimeric-18s-rdna-artifact
#8
Daniele Corsaro, Danielle Venditti
Free-living amoebae of the genus Acanthamoeba are potentially pathogenic protozoa widespread in the environment. The detection/diagnosis as well as environmental survey strategies is mainly based on the identification of the 18S rDNA sequences of the strains that allow the recovery of various distinct genotypes/subgenotypes. The accurate recording of such data is important to better know the environmental distribution of distinct genotypes and how they may be preferentially associated with disease. Recently, a putative new acanthamoebal genotype T99 was introduced, which comprises only environmental clones apparently with some anomalous features...
November 25, 2017: Parasitology Research
https://www.readbyqxmd.com/read/29177480/comparative-genomic-analysis-of-acanthamoeba-endosymbionts-highlights-the-role-of-amoebae-as-a-melting-pot-shaping-the-rickettsiales-evolution
#9
Zhang Wang, Martin Wu
Amoebae have been considered as a genetic 'melting pot' for its symbionts, facilitating genetic exchanges of the bacteria that co-inhabit the same host. To test the 'melting pot' hypothesis, we analyzed six genomes of amoeba endosymbionts within Rickettsiales, four of which belong to family Holosporaceae and two to Candidatus Midichloriaceae. For the first time, we identified plasmids in obligate amoeba endosymbionts, which suggests conjugation as a potential mechanism for lateral gene transfers (LGTs) that underpin the 'melting pot' hypothesis...
November 21, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/29165144/isolation-and-identification-of-acanthamoeba-strains-from-soil-and-tap-water-in-yanji-china
#10
Yinghua Xuan, Yanqin Shen, Yuxi Ge, Gen Yan, Shanzi Zheng
BACKGROUND: Members of the genus Acanthamoeba are widely distributed throughout the world, and some of them are considered pathogenic, as they are capable of causing corneal and central nervous system diseases. In this study, we isolated Acanthamoeba strains from soil and tap water in Yanji, China. METHODS: We identified four strains of Acanthamoeba (CJY/S1, CJY/S2, CJY/S3, and CJY/W1) using mitochondrial DNA restriction fragment length polymorphism (mtDNA RFLP) analysis...
June 30, 2017: Environmental Health and Preventive Medicine
https://www.readbyqxmd.com/read/29161575/sulfadiazine-ciprofloxacin-promote-opportunistic-pathogens-occurrence-in-bulk-water-of-drinking-water-distribution-systems
#11
Haibo Wang, Yi Shen, Chun Hu, Xueci Xing, Dan Zhao
Effects of sulfadiazine and ciprofloxacin on the occurrence of free-living and particle-associated opportunistic pathogens in bulk water of simulated drinking water distribution systems (DWDSs) were investigated. It was found that sulfadiazine and ciprofloxacin greatly promoted the occurrence of opportunistic pathogens including Pseudomonas aeruginosa, Legionella pneumophila, Mycobacterium avium and its broader genus Mycobacterium spp., as well as the amoebae Acanthamoeba spp. and Hartmanella vermiformis, in bulk water of DWDSs...
November 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29155010/intra-amoebal-killing-of-mycobacterium-ulcerans-by-acanthamoeba-griffini-a-co-culture-model
#12
Amar Bouam, Eric Ghigo, Michel Drancourt
Mycobacterium ulcerans, a decaying Mycobacterium marinum derivative is responsible for Buruli ulcer, a notifiable non-contagious disabling infection highly prevalent in some West African countries. Aquatic environments are suspected to host M. ulcerans, however, the exact reservoirs remain unknown. While M. marinum was found to resist amoebal microbicidal activities, this remains unknown for M. ulcerans. In this study M. ulcerans was co-cultured with the moderately halophile Acanthamoeba griffini at 30 °C to probe this tropical amoeba as a potential reservoir for M...
November 17, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29150507/divalent-metal-cations-potentiate-the-predatory-capacity-of-amoeba-for-cryptococcus-neoformans
#13
Man Shun Fu, Arturo Casadevall
Among the best studied interaction between soil phagocytic predators and a human pathogenic fungus is that of Acanthamoeba castellanii and Cryptococcus neoformans The experimental conditions used in amoeba-fungal confrontation assays can have major effects on whether the fungus or the protozoan is ascendant in the interaction. In the presence of Mg(2+) and Ca(2+) in PBS, C. neoformans was consistently killed when incubated with A. castellanii. A. castellanii survived better in the presence of Mg(2+) and Ca(2+), even when incubated with C...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29133630/non-contact-lens-related-acanthamoeba-keratitis
#14
REVIEW
Prashant Garg, Paavan Kalra, Joveeta Joseph
The purpose of the study is to describe epidemiology, clinical features, diagnosis, and treatment of Acanthamoeba keratitis (AK) with special focus on the disease in nonusers of contact lenses (CLs). This study was a perspective based on authors' experience and review of published literature. AK accounts for 2% of microbiology-proven cases of keratitis. Trauma and exposure to contaminated water are the main predisposing factors for the disease. Association with CLs is seen only in small fraction of cases. Contrary to classical description experience in India suggests that out of proportion pain, ring infiltrate, and radial keratoneuritis are seen in less than a third of cases...
November 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29120114/molecular-prevalence-of-chlamydia-and-chlamydia-like-bacteria-in-tunisian-domestic-ruminant-farms-and-their-influencing-risk-factors
#15
M Barkallah, H Jribi, A Ben Slima, Y Gharbi, Z Mallek, M Gautier, I Fendri, R Gdoura
Chlamydia and Chlamydia-like bacteria are well known to infect several organisms and may cause a wide range of diseases, particularly in ruminants. To gain insight into the prevalence and diversity of these intracellular bacteria, we applied a pan-Chlamydiales real-time PCR to 1,134 veterinary samples taken from 130 Tunisian ruminant herds. The true adjusted animal population-level prevalence was 12.9% in cattle, against 8.7% in sheep. In addition, the true adjusted herd-level prevalence of Chlamydiae was 80% in cattle and 25...
November 9, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/29117746/in-vitro-evaluation-of-the-amoebicidal-activity-of-rosemary-rosmarinus-officinalis-l-and-cloves-syzygium-aromaticum-l-merr-perry-essential-oils-against-acanthamoeba-polyphaga-trophozoites
#16
Immacolata Anacarso, Carla Sabia, Simona de Niederhäusern, Ramona Iseppi, Carla Condò, Moreno Bondi, Patrizia Messi
Several species of the genus Acanthamoeba cause human diseases. Treatment of infections involves various problems, emphasising the need to develop alternative antiprotozoal agents. We studied the anti-amoebic activity of Essential Oils (EOs), derived from rosemary (Rosmarinus officinalis L.) and cloves (Syzygium aromaticum L. Merr. & Perry), against Acanthamoeba polyphaga strain. The amoebicidal activity of cloves and rosemary EOs was preliminary demonstrated by the morphology change (modifications in the cell shape, the presence of precipitates in the cytoplasm, autophagic vesicles, membrane blends) of the treated trophozoites...
November 8, 2017: Natural Product Research
https://www.readbyqxmd.com/read/29114120/free-living-amoebae-in-the-water-resources-of-iran-a-systematic-review
#17
REVIEW
Ehsan Saburi, Toktam Rajaii, Asma Behdari, Mohammad Hasan Kohansal, Hossein Vazini
Free-living amoebae (FLA) are a group of protozoa with the capabilities of growth in the environment and invasion to the human body which have been isolated from different water sources. Acanthamoeba, Naegleria, and Balamuthia are the most important FLA. These cause a variety of severe complications of eye and central nervous system. Despite the fact that various studies have demonstrated the prevalence of FLA in different parts of Iran, there is no comprehensive evaluation and conclusion regarding the pollution of various water sources in Iran...
December 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/29111996/microbial-keratitis-after-accelerated-corneal-collagen-cross-linking-in-keratoconus
#18
Prafulla K Maharana, Pranita Sahay, M Sujeeth, Deepali Singhal, Anubha Rathi, Jeewan S Titiyal, Namrata Sharma
PURPOSE: To assess the pattern of microbial keratitis after accelerated corneal collagen cross-linkage (aCXL) in patients with keratoconus. METHOD: The medical records of cases of keratoconus that underwent aCXL from June 2014 to May 2017 were reviewed. Cases that developed microbial keratitis after aCXL were included in the study. The clinical, microbiological profile and the treatment outcomes were evaluated. RESULTS: Of 532 eyes that underwent aCXL, 7 cases developed microbial keratitis during the study period...
November 2, 2017: Cornea
https://www.readbyqxmd.com/read/29111995/diagnostic-evaluation-of-co-occurrence-of-acanthamoeba-and-fungi-in-keratitis-a-preliminary-report
#19
Anita Raghavan, Shaffie Baidwal, Prabhu Vijayaraghavan, Sakthi Rajeswari, Revathi Rajaraman, Narendran Venkatapathy, Sunitha Menon, Ram Rammohan
PURPOSE: To test the hypothesis that the coexistence of Acanthamoeba with other forms of microbial keratitis, especially fungal keratitis (FK), is more prevalent than suspected. METHODS: A prospective diagnostic study whereby patients presenting with stromal keratitis were additionally tested for Acanthamoeba, irrespective of the initial diagnosis. In addition to the routine workup with Gram stain, KOH mount, and cultures on blood agar and potato dextrose agar, nonnutrient agar was included...
November 14, 2017: Cornea
https://www.readbyqxmd.com/read/29103901/parasitic-amoebae-found-in-water-bodies-of-ukraine
#20
Marina Patsyuk
Two parasitic amoebian species are found in mollusks of the water bodies of Ukraine. Vahlkampfia sp. is found in hepatopankreas of Unio conus Spengler, 1793, and Acanthamoeba sp. is observed in mantle cavity of Viviparus viviparus Linnaeus, 1758. For these protist species, the mollusks are shown to be intermediate hosts where amoebae feed and reproduce. An experimental infection with Vahlkampfia sp. and Acanthamoeba sp. was not successful, no pathological changes in mollusks were observed. These amoebae are successfully cultured in fresh water and agar medium, hence we can safely consider them free-living...
November 2, 2017: Experimental Parasitology
keyword
keyword
116438
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"