Navigation Links
Disrupting Cocaine-memories To Battle Addiction

Novel use of genetic testing methods helped public health officials control and limit the further spread of four outbreaks of foodborne hepatitis A virus in 2003 related to the consumption of green onions, according to a detailed analysis published in the October 15 issue of The Journal of Infectious Diseases, now available online.

The authors of the study, Joseph J. Amon, PhD, MSPH, and colleagues at the Centers for Disease Control and Prevention (CDC), explained that these molecular epidemiologic methods had not previously been used in an ongoing investigation of a hepatitis A virus outbreak. The methods, involving genetic sequencing analysis of virus found in blood samples from infected individuals, have greatly improved understanding of outbreaks of other foodborne pathogens, but are time-consuming and not widely available.

In September 2003, Tennessee, North Carolina, and Georgia reported a total of 422 cases of foodborne hepatitis A virus infection to CDC. Preliminary investigations suggested clustering of reported cases among patrons of three unrelated restaurants. Investigators identified green onions as the likely culprit in the outbreak by interviewing infected and uninfected restaurant patrons. In addition to these standard techniques, the researchers also compared viral RNA sequences from case patients and individuals concurrently ill with hepatitis A virus infection in non-outbreak settings in the United States and Mexico.

Viral RNA sequences from patients in the three states, plus patients involved in a subsequent outbreak in Pennsylvania in October 2003 (the latter recently described in the Sept. 1 issue of the New England Journal of Medicine), were slightly different from each other. The viral sequence from each outbreak, however, was identical to one or more sequences isolated from northern Mexican residents infected with hepatitis A virus. The researchers concluded that the sources of the green onions served in restaurants in Tennessee and Georgia were three farms in northern Mexico.

Dr. Amon and colleagues credited the viral sequencing techniques with helping them to identify the relationships between the outbreaks in four separate locations, and to define the scope of the outbreaks quickly. The sequencing allowed them to determine if cases reported in other states were related to the four original outbreaks and provided reassurance that a larger outbreak was not occurring. The molecular epidemiologic methods also enabled public health officials to respond quickly to the later Pennsylvania outbreak. As a result, consumers were warned of the potential risk, and entry of green onions from four Mexican farms into the state was banned.

"This research highlights the role of viral sequence analysis in improving our overall understanding of the roughly 50 percent of hepatitis A cases in the U.S. that are from an unknown source," Dr. Amon said. "Just as the E. coli-contaminated beef outbreaks in the early 1990s prompted changes in epidemiological surveillance that have increased our knowledge of foodborne bacteria, the 2003 hepatitis A outbreaks demonstrated the potential for integrated molecular surveillance to provide a better understanding of the epidemiology of hepatitis A and facilitate rapid responses to outbreaks."


'"/>

Source:


Related biology news :

1. Beneficial Beetles Battle Pesky Saltcedar
2. Bees, Brains and Addiction
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/11/2017)... 2017 No two people are believed ... New York University Tandon School of Engineering and ... that partial similarities between prints are common enough ... phones and other electronic devices can be more ... lies in the fact that fingerprint-based authentication systems ...
(Date:4/5/2017)... LONDON , April 4, 2017 KEY ... is anticipated to expand at a CAGR of 25.76% ... neurodegenerative diseases is the primary factor for the growth ... full report: https://www.reportbuyer.com/product/4807905/ MARKET INSIGHTS The ... of product, technology, application, and geography. The stem cell ...
(Date:3/30/2017)... March 30, 2017 Trends, opportunities and forecast ... behavioral), by technology (fingerprint, AFIS, iris recognition, facial recognition, ... others), by end use industry (government and law enforcement, ... and banking, and others), and by region ( ... Asia Pacific , and the Rest ...
Breaking Biology News(10 mins):
(Date:10/10/2017)... Angeles, CA (PRWEB) , ... ... ... Inc., a development-stage cancer-focused pharmaceutical company advancing targeted antibody-drug conjugate (ADC) therapeutics, ... uses of targeted HPLN (Hybrid Polymerized Liposomal Nanoparticle), a technology developed in ...
(Date:10/10/2017)... ... October 10, 2017 , ... Dr. Bob Harman, founder and ... San Diego Rotary Club. The event entitled “Stem Cells and Their ... 300+ attendees. Dr. Harman, DVM, MPVM was joined by two human doctors: Peter ...
(Date:10/10/2017)... , Oct. 10, 2017 SomaGenics announced ... the NIH to develop RealSeq®-SC (Single Cell), expected to ... profiling small RNAs (including microRNAs) from single cells using ... highlights the need to accelerate development of approaches to ... "New techniques for measuring levels of ...
(Date:10/10/2017)... ... October 10, 2017 , ... The Pittcon Program Committee ... honoring scientists who have made outstanding contributions to analytical chemistry and applied ... the world’s leading conference and exposition for laboratory science, which will be held ...
Breaking Biology Technology: