Posts filed under ‘Infecciones y Alimentos’

Toxoplasmosis: The Heart of the Diagnosis

OPEN FORUM INFECTIOUS DISEASES January 2019 V.6 N.1

James H England; Samuel S Bailin; Jeffrey R Gehlhausen; Donald H Rubin

Toxoplasma gondii is a common parasite that infects warm-blooded animals, including humans, and is a foodborne pathogen. We report a case of acute toxoplasmosis in a 76-year-old man after ingestion of the undercooked heart of a white-tailed deer (Odocoileus virginianus) in Tennessee. The patient’s adult grandson, who also consumed part of the heart, became ill with nearly identical symptoms, though he did not seek medical care. This case highlights important public health concerns about deer-to-human transmission of Toxoplasma.

FULL TEXT

https://academic.oup.com/ofid/article/6/1/ofy338/5250666

PDF (CLIC en PDF)

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January 20, 2019 at 12:17 pm

Extended-spectrum cephalosporin-resistant Escherichia coli isolated from chickens and chicken meat in Brazil is associated with rare and complex resistance plasmids and pandemic ST lineages

Journal of Antimicrobial Chemotherapy   1 December 2018  V.73  N.2  P.3293–3297

EDITOR’S CHOICE

Tiago Casella; Marisa Haenni; Naiady Konno Madela; Letícia Kellen de Andrade; Letícia Kalir Pradela …

Objectives

Brazil is the greatest exporter of chicken meat (CM) in the world. It is of utmost importance to monitor resistance to extended-spectrum cephalosporins (ESCs) in this sector because resistance to ESCs in Escherichia coli isolated from food-producing animals may contaminate humans through the food chain. Thus, the aim of this study was to characterize and compare ESC-resistant E. coli isolated from chickens and retail CM produced in south-eastern Brazil.

Methods

Five CM samples and 117 chicken cloacal swabs (CCSs) were inoculated on MacConkey agar supplemented with cefotaxime. Presumptive E. coli colonies were identified and antimicrobial susceptibility was tested. Virulence and acquired blaESBL and blaAmpC genes were sought and genetic environments characterized. Isolates were typed by phylogenetic grouping, XbaI-PFGE and MLST.

Results

All five CM samples and 36 CCSs (30.8%) were positive for the presence of ESC-resistant E. coli, leading to the selection of 58 resistant isolates. ESC resistance was mostly due to the presence of the chromosome-encoded blaCTX-M-2 gene, but plasmid-mediated blaCTX-M-2, blaCTX-M-8, blaCTX-M-15, blaCTX-M-55 and blaCMY-2 were also detected. Multireplicon plasmids were sporadically identified, such as IncHI2/P-blaCTX-M-2 and IncFII/N-blaCTX-M-55. Phylogroup D predominated, while PFGE and MLST revealed a high genetic diversity.

Conclusions

Live Brazilian chickens and CM act as reservoirs of ESC-resistant E. coli and resistance genes are located on highly diverse genetic determinants. Potentially pathogenic strains, which may represent a threat to human health and a source of environmental contamination, were also identified. Active surveillance is therefore essential in Brazil’s chicken production line.

FULL TEXT

https://academic.oup.com/jac/article/73/12/3293/5088381

PDF (CLIC en PDF

January 5, 2019 at 11:47 pm

Current Knowledge on Listeria monocytogenes Biofilms in Food-Related Environments: Incidence, Resistance to Biocides, Ecology and Biocontrol.

Foods. 2018 Jun 5;7(6). pii: E85.

Rodríguez-López P1, Rodríguez-Herrera JJ2, Vázquez-Sánchez D3, López Cabo M4.

Abstract

Although many efforts have been made to control Listeria monocytogenes in the food industry, growing pervasiveness amongst the population over the last decades has made this bacterium considered to be one of the most hazardous foodborne pathogens. Its outstanding biocide tolerance capacity and ability to promiscuously associate with other bacterial species forming multispecies communities have permitted this microorganism to survive and persist within the industrial environment. This review is designed to give the reader an overall picture of the current state-of-the-art in L. monocytogenes sessile communities in terms of food safety and legislation, ecological aspects and biocontrol strategies.

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6025129/pdf/foods-07-00085.pdf

July 19, 2018 at 3:37 pm

To Be Cytosolic or Vacuolar: The Double Life of Listeria monocytogenes.

Front Cell Infect Microbiol. 2018 May 15;8:136.

Bierne H1, Milohanic E1, Kortebi M1.

Abstract

Intracellular bacterial pathogens are generally classified into two types: those that exploit host membrane trafficking to construct specific niches in vacuoles (i.e., “vacuolar pathogens”), and those that escape from vacuoles into the cytosol, where they proliferate and often spread to neighboring cells (i.e., “cytosolic pathogens”). However, the boundary between these distinct intracellular phenotypes is tenuous and may depend on the timing of infection and on the host cell type. Here, we discuss recent progress highlighting this phenotypic duality in Listeria monocytogenes, which has long been a model for cytosolic pathogens, but now emerges as a bacterium also capable of residing in vacuoles, in a slow/non-growing state. The ability of L. monocytogenes to enter a persistence stage in vacuoles might play a role during the asymptomatic incubation period of listeriosis and/or the carriage of this pathogen in asymptomatic hosts. Moreover, persistent vacuolar Listeria could be less susceptible to antibiotics and more difficult to detect by routine techniques of clinical biology. These hypotheses deserve to be explored in order to better manage the risks related to this food-borne pathogen.

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5962784/pdf/fcimb-08-00136.pdf

July 19, 2018 at 3:36 pm

Campylobacteriosis, Salmonellosis, Yersiniosis, and Listeriosis as Zoonotic Foodborne Diseases: A Review.

Int J Environ Res Public Health. 2018 Apr 26;15(5). pii: E863.

Chlebicz A1, Śliżewska K2.

Abstract

Zoonoses are diseases transmitted from animals to humans, posing a great threat to the health and life of people all over the world. According to WHO estimations, 600 million cases of diseases caused by contaminated food were noted in 2010, including almost 350 million caused by pathogenic bacteria. Campylobacter, Salmonella, as well as Yersinia enterocolitica and Listeria monocytogenes may dwell in livestock (poultry, cattle, and swine) but are also found in wild animals, pets, fish, and rodents. Animals, often being asymptomatic carriers of pathogens, excrete them with faeces, thus delivering them to the environment. Therefore, pathogens may invade new individuals, as well as reside on vegetables and fruits. Pathogenic bacteria also penetrate food production areas and may remain there in the form of a biofilm covering the surfaces of machines and equipment. A common occurrence of microbes in food products, as well as their improper or careless processing, leads to common poisonings. Symptoms of foodborne infections may be mild, sometimes flu-like, but they also may be accompanied by severe complications, some even fatal. The aim of the paper is to summarize and provide information on campylobacteriosis, salmonellosis, yersiniosis, and listeriosis and the aetiological factors of those diseases, along with the general characteristics of pathogens, virulence factors, and reservoirs

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5981902/pdf/ijerph-15-00863.pdf

July 19, 2018 at 3:35 pm

Minireview – Nipah Virus Infection

J. Clin. Microbiol. June 2018 56:10 e01875-17

Brenda S. P. Ang, Tchoyoson C. C. Lim, and Linfa Wang

Nipah virus, a paramyxovirus related to Hendra virus, first emerged in Malaysia in 1998.

Clinical presentation ranges from asymptomatic infection to fatal encephalitis.

Malaysia has had no more cases since 1999, but outbreaks continue to occur in Bangladesh and India.

In the Malaysia-Singapore outbreak, transmission occurred primarily through contact with pigs, whereas in Bangladesh and India, it is associated with ingestion of contaminated date palm sap and human-to-human transmission.

Bats are the main reservoir for this virus, which can cause disease in humans and animals.

There are currently no effective therapeutics, and supportive care and prevention are the mainstays of management.

abstract

http://jcm.asm.org/content/56/6/e01875-17.abstract

PDF

http://jcm.asm.org/content/56/6/e01875-17.full.pdf+html

June 12, 2018 at 7:37 am

Pre-existing medical conditions associated with Vibrio vulnificus septicaemia.

Epidemiol Infect. 2014 Apr;142(4):878-81.

Menon MP1, Yu PA1, Iwamoto M1, Painter J1.

Author information

1Division of Foodborne, Waterborne and Environmental Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.

Abstract

Vibrio vulnificus (Vv) can result in severe disease. Although pre-existing liver disease is a recognized risk factor for serious infection, the relative importance of other comorbidities has not been fully assessed.

We analysed reports of Vv infections submitted to CDC from January 1988 to September 2006 in order to assess the role of pre-existing conditions contributing to severe outcomes.

A total of 1212 patients with Vv infection were reported. Only patients with liver disease [adjusted odds ratio (aOR) 5.1)] were more likely to become septic when exposure was due to contaminated food.

Patients with liver disease (aOR 4.1), a haematological disease (aOR 3.2), or malignancy (aOR 3.2) were more likely to become septic when infection was acquired via a non-foodborne exposure.

As such, patients with these pre-existing medical conditions should be advised of the risk of life-threatening illness after eating undercooked contaminated seafood or exposing broken skin to warm seawater

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4598054/pdf/nihms727972.pdf

February 17, 2017 at 4:39 pm

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