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https://www.readbyqxmd.com/read/28222130/dengue-virus-antibody-database-systematically-linking-serotype-specificity-with-epitope-mapping-in-dengue-virus
#1
Sidhartha Chaudhury, Gregory D Gromowski, Daniel R Ripoll, Ilja V Khavrutskii, Valmik Desai, Anders Wallqvist
BACKGROUND: A majority infections caused by dengue virus (DENV) are asymptomatic, but a higher incidence of severe illness, such as dengue hemorrhagic fever, is associated with secondary infections, suggesting that pre-existing immunity plays a central role in dengue pathogenesis. Primary infections are typically associated with a largely serotype-specific antibody response, while secondary infections show a shift to a broadly cross-reactive antibody response. METHODS/PRINCIPAL FINDINGS: We hypothesized that the basis for the shift in serotype-specificity between primary and secondary infections can be found in a change in the antibody fine-specificity...
February 21, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28221976/listeria-monocytogenes-in-smoked-salmon-and-other-smoked-fish-at-retail-in-italy-frequency-of-contamination-and-strain-characterization-in-products-from-different-manufacturers
#2
Vicdalia Aniela Acciari, Marina Torresi, Luigi Iannetti, Silvia Scattolini, Francesco Pomilio, Lucia Decastelli, Silvia Colmegna, Riccardo Muliari, Teresa Bossù, Yolande Proroga, Cosimo Montagna, Cinzia Cardamone, Paola Cogoni, Vincenza Annunziata Prencipe, Giacomo Migliorati
Seven hundred seventy-eight samples of packaged smoked fish (774 smoked salmon and 4 smoked swordfish) on sale in Italy, from 50 different manufacturers located in 12 European Union countries, were purchased from the Italian market between May and December 2011. The surface temperatures of the samples on sale ranged from 0 to 13°C (3.4 ± 1.5°C, mean ± SD). Six hundred eighty (87.4%) of 778 samples were stored at ≤4°C. One hundred fifty-seven samples (20.2%, 95% confidence interval 17.5 to 23.1%) were contaminated by Listeria monocytogenes , with 26 samples (3...
February 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28221971/characterizing-salmonella-contamination-in-two-rendering-processing-plants
#3
Chao Gong, Xiuping Jiang
A microbiological investigation on Salmonella contamination was conducted in two U.S. rendering plants to investigate the potential cross-contamination of Salmonella in the rendering processing environment. Sampling locations were predetermined at the areas where Salmonella contamination may potentially occur, including raw materials receiving, crax (rendered materials before grinding process) grinding, and finished meal loading-out areas. Salmonella was either enumerated directly on xylose lysine Tergitol 4 agar plates or enriched in Rappaport-Vassiliadis and tetrathionate broths...
February 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28221921/national-survey-of-shiga-toxin-producing-escherichia-coli-serotypes-o26-o45-o103-o111-o121-o145-and-o157-in-australian-beef-cattle-feces
#4
Glen E Mellor, Narelle Fegan, Lesley L Duffy, Kate E McMILLAN, David Jordan, Robert S Barlow
Escherichia coli O157 and six non-O157 Shiga toxin-producing E. coli (STEC) serotypes (O26, O45, O103, O111, O121, and O145, colloquially referred to as the "big 6") have been classified as adulterants of raw nonintact beef products in the United States. While beef cattle are a known reservoir for the prototype STEC serotype, E. coli O157, less is known about the dissemination of non-O157 STEC serotypes in Australian cattle. In the present study, 1,500 fecal samples were collected at slaughter from adult (n =628) and young (n =286) beef cattle, adult (n =128) and young (n =143) dairy cattle, and veal calves (n = 315) across 31 Australian export-registered processing establishments...
November 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221916/characterization-and-antimicrobial-resistance-of-salmonella-typhimurium-isolates-from-clinically-diseased-pigs-in-korea
#5
Sang-Ik Oh, Jong Wan Kim, Myeongju Chae, Ji-A Jung, Byungjae So, Bumseok Kim, Ha-Young Kim
This study investigated the prevalence of Salmonella enterica serovar and antimicrobial resistance in Salmonella Typhimurium isolates from clinically diseased pigs collected from 2008 to 2014 in Korea. Isolates were also characterized according to the presence of antimicrobial resistance genes and pulsed-field gel electrophoresis patterns. Among 94 Salmonella isolates, 81 (86.2%) were identified as being of the Salmonella Typhimurium serotype, followed by Salmonella Derby (6 of 94, 6.4%), Salmonella 4,[5],12:i:- (4 of 94, 4...
November 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221901/prevalence-and-persistence-of-listeria-monocytogenes-in-ready-to-eat-tilapia-sashimi-processing-plants
#6
Bang-Yuan Chen, Chung-Yi Wang, Chia-Lan Wang, Yang-Chi Fan, I-Ting Weng, Chung-Hsi Chou
A 2-year study was performed at two ready-to-eat tilapia sashimi processing plants (A and B) to identify possible routes of contamination with Listeria monocytogenes during processing. Samples were collected from the aquaculture environments, transportation tanks, processing plants, and final products. Seventy-nine L. monocytogenes isolates were found in the processing environments and final products; 3.96% (50 of 1,264 samples) and 3.86% (29 of 752 samples) of the samples from plants A and B, respectively, were positive for L...
November 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221883/enrichment-amplification-and-sequence-based-typing-of-salmonella-enterica-and-other-foodborne-pathogens
#7
Tom Edlind, Jeffrey D Brewster, George C Paoli
Detection of Salmonella enterica in foods typically involves microbiological enrichment, molecular-based assay, and subsequent isolation and identification of a pure culture. This is ideally followed by strain typing, which provides information critical to the investigation of outbreaks and the attribution of their sources. Pulsed-field gel electrophoresis is the "gold standard" for S. enterica strain typing, but its limitations have encouraged the search for alternative methods, including whole genome sequencing...
January 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28221880/spread-of-a-major-clone-of-salmonella-enterica-serotype-enteritidis-in-poultry-and-in-salmonellosis-outbreaks-in-southern-brazil
#8
Karen Apellanis Borges, Thales Quedi Furian, Sara Neves de Souza, Eduardo César Tondo, André Felipe Streck, Carlos Tadeu Pippi Salle, Hamilton Luiz de Souza Moraes, Vladimir Pinheiro do Nascimento
Salmonella spp. are among the most important agents of foodborne diseases all over the world. Human Salmonella outbreaks are often associated with the consumption of poultry products (meat and eggs), and one of the most prevalent serotypes associated with these products is Salmonella Enteritidis. Brazil is one of the most important poultry exporters in the world. In southern Brazil, three closely related clones of Salmonella Enteritidis have been responsible for the majority of foodborne Salmonella outbreaks over the past decade...
January 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28221855/survival-kinetics-of-salmonella-enterica-and-enterohemorrhagic-escherichia-coli-on-a-plastic-surface-at-low-relative-humidity-and-on-low-water-activity-foods
#9
Hidekazu Hokunan, Kento Koyama, Mayumi Hasegawa, Shuso Kawamura, Shigenobu Koseki
We investigated the survival kinetics of Salmonella enterica and enterohemorrhagic Escherichia coli under various water activity (aw) conditions to elucidate the net effect of aw on pathogen survival kinetics and to pursue the development of a predictive model of pathogen survival as a function of aw. Four serotypes of S. enterica (Stanley, Typhimurium, Chester, and Oranienburg) and three serotypes of enterohemorrhagic E. coli ( E. coli O26, E. coli O111, and E. coli O157:H7) were examined. These bacterial strains were inoculated on a plastic plate surface at a constant relative humidity (RH) (22, 43, 58, 68, or 93% RH, corresponding to the aw) or on a surface of almond kernels (aw 0...
October 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221838/use-of-the-escherichia-coli-identification-microarray-for-characterizing-the-health-risks-of-shiga-toxin-producing-escherichia-coli-isolated-from-foods
#10
David W Lacher, Jayanthi Gangiredla, Isha Patel, Christopher A Elkins, Peter C H Feng
More than 470 serotypes of Shiga toxin-producing Escherichia coli (STEC) have been identified, but not all cause severe illness in humans. Most STEC that cause severe diseases can adhere to epithelial cells, produce specific stx subtypes, and belong to certain serotypes; therefore, these traits appear to be critical STEC risk factors. However, testing for these traits is labor intensive, and serotyping is inadequate because of extensive variations among E. coli O and H antigen types. In the present study, the E...
October 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28220749/epidemiology-of-invasive-haemophilus-influenzae-disease-europe-2007-2014
#11
Robert Whittaker, Assimoula Economopoulou, Joana Gomes Dias, Elizabeth Bancroft, Miriam Ramliden, Lucia Pastore Celentano
We describe the epidemiology of invasive Haemophilus influenzae disease during 2007-2014 in 12 European countries and assess overall H. influenzae disease trends by serotype and patient age. Mean annual notification rate was 0.6 cases/100,000 population, with an increasing annual trend of 3.3% (95% CI 2.3% to 4.3%). The notification rate was highest for patients <1 month of age (23.4 cases/100,000 population). Nontypeable H. influenzae (NTHi) caused 78% of all cases and showed increasing trends among persons <1 month and >20 years of age...
March 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28219668/outbreak-of-dengue-virus-type-3-in-malakand-pakistan-2015-a-laboratory-perspective
#12
Muhammad Suleman, Rani Faryal, Muhammad Masroor Alam, Adnan Khurshid, Salmaan Sharif, Shahzad Shaukat, Mehar Angez, Massab Umair, Mian Muhammad Sufian, Yasir Arshad, Tanveer Inam, Syed Sohail Zahoor Zaidi
An outbreak of dengue fever was reported in Malakand district, Khyber Pakhtunkhwa (KP) province of Pakistan during 2015. Detection of viral RNA by real-time PCR confirmed dengue virus serotype-3 (DENV-3) to be the causative agent causing the outbreak. Phylogenetic analysis based on partial E-NS1 gene sequences showed that the DENV-3 viruses belonged to genotype III with maximum homology with the dengue-3 strains previously reported from Pakistan and India. Our current report provides updated information on molecular epidemiology and phylogenetic analysis of dengue virus serotypes responsible for 2015 outbreak in KP...
February 17, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28219454/the-characterization-of-bordetella-pertussis-strains-isolated-in-the-central-western-region-of-brazil-suggests-the-selection-of-a-specific-genetic-profile-during-2012-2014-outbreaks
#13
E L Rocha, D Leite, C H Camargo, L M Martins, R S N Silva, V P Martins, T A Campos
Pertussis is a worldwide acute respiratory disease caused by the bacterium Bordetella pertussis. Despite high vaccine coverage, the bacterium continues to circulate in populations and is still one of the most common vaccine-preventable diseases. In Brazil, pertussis incidence has presented a significant decrease since 1990 but since 2011 a sudden increase in incidence has been observed. Thus, the aim of this study was to perform a molecular epidemiological characterization of B. pertussis strains isolated in the Central-Western region (specifically in Distrito Federal) of Brazil from August 2012 to August 2014...
February 21, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28219415/genotyping-and-investigating-capsular-polysaccharide-synthesis-gene-loci-of-non-serotypeable-streptococcus-suis-isolated-from-diseased-pigs-in-canada
#14
Han Zheng, Xiaotong Qiu, David Roy, Mariela Segura, Pengchen Du, Jianguo Xu, Marcelo Gottschalk
Streptococcus suis (S. suis) is an important swine pathogen and an emerging zoonotic agent. Most clinical S. suis strains express capsular polysaccharides (CPS), which can be typed by antisera using the coagglutination test. In this study, 79 S. suis strains recovered from diseased pigs in Canada and which could not be typed using antisera were further characterized by capsular gene typing and sequencing. Four patterns of cps locus were observed: (1) fifteen strains were grouped into previously reported serotypes but presented several mutations in their cps loci, when compared to available data from reference strains; (2) seven strains presented a complete deletion of the cps locus, which would result in an inability to synthesize capsule; (3) forty-seven strains were classified in recently described novel cps loci (NCLs); and (4) ten strains carried novel NCLs not previously described...
February 20, 2017: Veterinary Research
https://www.readbyqxmd.com/read/28219155/-genotype-distribution-of-human-enteroviruses-isolated-from-swage-in-shanghai-during-year-2013-2014
#15
Y Y Li, J Lu, X Z Wang, Y Y Yang, J Fei, L P Zhang, Z Li, C S Li, Y Zuo
Objective: To explore the time and genotype distribution of human enterovirus (HEV) isolated from sewage in Shanghai in 2013-2014. Methods: One sewage sample each was collected from two local sewage plants located in Minhang District and Jiading District on the same day at the day 24-28 of every month from 2013 to 2014. Each sample weighed 1 L. The specimens were concentrated by anionic membrane absorption, eluted with beef extract solution, and then used to inoculate RD, HEp-2, and L20B cell lines. A total of 249 enterovirus strains were isolated from sewage samples during the study period, including 185 non-polio enterovirus (NPEV) and 64 poliovirus (PV) strains, which were identified as vaccine strains...
February 6, 2017: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/28216181/changing-trends-in-serotypes-of-s-pneumoniae-isolates-causing-invasive-and-non-invasive-diseases-in-unvaccinated-population-in-mexico-2000-2014
#16
María Noemí Carnalla-Barajas, Araceli Soto-Noguerón, Miguel Angel Sánchez-Alemán, Fortino Solórzano-Santos, María Elena Velazquez-Meza, Gabriela Echániz-Aviles
OBJECTIVE: Introduction of pneumococcal conjugate vaccines (PCV) targeted against a limited number of serotypes substantially decreased invasive (IPD) and non-invasive pneumococcal diseases (NIPD) but it was accompanied by non-vaccine type replacement disease. After 9 years of introduction of PCV in Mexico, we analyze the evidence of the indirect effects on IPD and NIPD serotype distribution among groups not targeted to receive the vaccine. METHODS: From January 2000 to December 2014, pneumococcal strains isolated from IPD and NIPD cases from patients ≥5 years of age from participant hospitals of the SIREVA II (Sistema Regional de Vacunas) network, were serotyped...
February 16, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28216045/discovery-of-2-oxopiperazine-dengue-inhibitors-by-scaffold-morphing-of-a-phenotypic-high-throughput-screening-hit
#17
Cyrille S Kounde, Hui-Quan Yeo, Qing-Yin Wang, Kah Fei Wan, Hongping Dong, Ratna Karuna, Ina Dix, Trixie Wagner, Bin Zou, Oliver Simon, Ghislain M C Bonamy, Bryan K S Yeung, Fumiaki Yokokawa
A series of 2-oxopiperazine derivatives were designed from the pyrrolopiperazinone cell-based screening hit 4 as a dengue virus inhibitor. Systematic investigation of the structure-activity relationship (SAR) around the piperazinone ring led to the identification of compound (S)-29, which exhibited potent anti-dengue activity in the cell-based assay across all four dengue serotypes with EC50<0.1μM. Cross-resistant analysis confirmed that the virus NS4B protein remained the target of the new oxopiperazine analogs obtained via scaffold morphing from the HTS hit 4...
February 4, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28215920/antimicrobial-drug-resistance-and-genetic-properties-of-salmonella-enterica-serotype-enteritidis-circulating-in-chicken-farms-in-tunisia
#18
Rakia Ben Salem, Mohamed S Abbassi, Vanesa García, Raquel García-Fierro, Javier Fernández, Hajer Kilani, Imen Jaouani, Monia Khayeche, Lilia Messadi, María Rosario Rodicio
This study focused on 77 isolates of Salmonella enterica serotype Enteritidis collected during 2009 to 2013 from healthy and sick chickens and environmental farm samples in Tunisia. Resistance to 14 antimicrobials and the encoding genes were analyzed. 66, 26, 6.5, 3.9 and 1.3% were pan-susceptible or showed resistance to nalidixic acid (Asp87 to Tyr and Asp87 to Asn substitutions in GyrA), ampicillin (blaTEM-1-like and blaSHV), sulfonamides (sul1and sul3) and streptomycin (strB), respectively. A single isolate with intermediate susceptibility to ciprofloxacin was positive for qnrB, whereas qnrA, qnrS or aac(6')-Ib-cr were not detected...
February 16, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28215915/serotype-distribution-and-antimicrobial-susceptibility-of-streptococcus-pneumoniae-isolates-from-adult-patients-in-jakarta-indonesia
#19
Wahyu Finasari Said, Edy Sukoto, Miftahuddin Majid Khoeri, July Kumalawati, Dodi Safari
Currently, the data on pneumococcal invasive disease in the Indonesian population are limited. In this study, we investigated the serotype distribution and antimicrobial susceptibility of Streptococcus pneumoniae. These samples were isolated from the sputum of adult patients with non-specific clinical symptoms aged 18-87 years in Jakarta, Indonesia, from August to October 2014. Of the 349 sputum specimens, thirteen isolates were identified as S. pneumoniae strains (4%), with two strains each for serotype 19F, 3, and 15A, and one strain each for serotype/serogroup 13, 23A, 6, 34, 17F, 16F, and untypeable...
February 16, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28215186/complete-genome-characterization-and-evolutionary-analysis-of-serotype-4-associated-with-severe-dengue
#20
K Vaddadi, C Gandikota, M Venkataramana
Dengue virus circulates as four independent serotypes posing a major public health threat around the globe. In the recent years, frequent dengue outbreaks are being reported in many parts of the world including India. Among four serotypes, Den-4 is the least sampled and studied serotype until recent times, but the reported cases with Den-4 infections were mostly known to associate with severe dengue. In the past three decades, only one complete genome sequence of Den-4 has been published from India. Hence there is a deficit in information with reference to this serotype which would be required in deciphering its association with severe dengue...
February 20, 2017: Epidemiology and Infection
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