Featured Research

from universities, journals, and other organizations

Norovirus Found To Cause Traveler's Diarrhea

Date:
March 28, 2005
Source:
Johns Hopkins Bloomberg School Of Public Health
Summary:
A majority of traveler’s diarrhea cases among U.S. travelers to Mexico and Guatemala were attributed to Norovirus, a common cause of nonbacterial gastroenteritis outbreaks usually associated with developed countries, according to a new study by researchers at the Johns Hopkins Bloomberg School of Public Health and other institutions.

Kellogg J. Schwab, PhD.
Credit: Photo courtesy of Johns Hopkins Bloomberg School Of Public Health

A majority of traveler’s diarrhea cases among U.S. travelers to Mexico and Guatemala were attributed to Norovirus, a common cause of nonbacterial gastroenteritis outbreaks usually associated with developed countries, according to a new study by researchers at the Johns Hopkins Bloomberg School of Public Health and other institutions. The researchers also found that the longer travelers stayed at their destination, the more likely they were to contract Norovirus infections. The study is published in the March 2005 issue of the Journal of Clinical Microbiology.

“Noroviruses are known to be a major cause of food and waterborne gastronteritis outbreaks in domestic and unique settings, such as cruise ships, and also have been documented among military groups during deployment overseas. However, few studies have investigated the prevalence of Norovirus infection among civilians traveling from industrialized to developing countries,” said Kellogg J. Schwab, PhD, corresponding author of the study and an assistant professor in the Department of Environmental Health Sciences at the Johns Hopkins Bloomberg School of Public Health.

He explained that Noroviruses often are not considered in studies of traveler’s diarrhea because, until recently, molecular detection methods for these viruses have not been readily available in laboratories in the United States or other countries.

The researchers examined stool samples from 34 individuals who experienced traveler’s diarrhea during trips to Antigua, Guatemala or Cuernavaca, Mexico, for Noroviruses, as well as for bacterial and protozoan pathogens. Sixty-five percent of the individuals in the study had at least one stool sample positive for Norovirus. Although Norovirus previously has been implicated as a cause of traveler’s diarrhea among visitors to Mexico, this is the first study to indicate that Norovirus contributes to traveler’s diarrhea in visitors to Guatemala.

Amy R. Chapin, first author of the study and a PhD-candidate in the Department of Environmental Health Sciences at the Johns Hopkins Bloomberg School of Public Health, noted that 11 Norovirus-positive stool samples also were positive for E. coli, a leading bacterial cause of traveler’s diarrhea, thus indicating that dual infections among individuals experiencing traveler’s diarrhea may be more common than previously thought.

The authors said that further research into the role of Noroviruses in traveler’s diarrhea is warranted. The simple, inexpensive molecular diagnostic techniques used in this study to identify Norovirus-positive stool samples could serve to facilitate future Norovirus-related research in developing countries.

“Prevalence of Norovirus among U.S. Visitors to Mexico and Guatemala Experiencing Traveler’s Diarrhea” was supported by a grant from the Center for a Livable Future at the Johns Hopkins Bloomberg School of Public Health. Amy R. Chapin was also supported by a Howard Hughes Medical Institute Predoctoral Fellowship in Biological Sciences.

Co-authors of the study were Colleen M. Carpenter, William C. Dudley, Lucy C. Gibson, Rafael Pratdesaba, Olga Torres, Domingo Sanchez, Jaime Belkind-Gerson, Irene Nyquist, Anders Karnell, Bjorn Gustafsson, Jane L. Halpern and A. Louis Bourgeois.


Story Source:

The above story is based on materials provided by Johns Hopkins Bloomberg School Of Public Health. Note: Materials may be edited for content and length.


Cite This Page:

Johns Hopkins Bloomberg School Of Public Health. "Norovirus Found To Cause Traveler's Diarrhea." ScienceDaily. ScienceDaily, 28 March 2005. <www.sciencedaily.com/releases/2005/03/050325150320.htm>.
Johns Hopkins Bloomberg School Of Public Health. (2005, March 28). Norovirus Found To Cause Traveler's Diarrhea. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2005/03/050325150320.htm
Johns Hopkins Bloomberg School Of Public Health. "Norovirus Found To Cause Traveler's Diarrhea." ScienceDaily. www.sciencedaily.com/releases/2005/03/050325150320.htm (accessed July 30, 2014).

Share This




More Health & Medicine News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Health Insurers' Profits Slide

Health Insurers' Profits Slide

Reuters - Business Video Online (July 30, 2014) Obamacare-related costs were said to be behind the profit plunge at Wellpoint and Humana, but Wellpoint sees the new exchanges boosting its earnings for the full year. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Concern Grows Over Worsening Ebola Crisis

Concern Grows Over Worsening Ebola Crisis

AFP (July 30, 2014) Pan-African airline ASKY has suspended all flights to and from the capitals of Liberia and Sierra Leone amid the worsening Ebola health crisis, which has so far caused 672 deaths in Guinea, Liberia and Sierra Leone. Duration: 00:43 Video provided by AFP
Powered by NewsLook.com
At Least 20 Chikungunya Cases in New Jersey

At Least 20 Chikungunya Cases in New Jersey

AP (July 30, 2014) At least 20 New Jersey residents have tested positive for chikungunya, a mosquito-borne virus that has spread through the Caribbean. (July 30) Video provided by AP
Powered by NewsLook.com
Generics Eat Into Pfizer's Sales

Generics Eat Into Pfizer's Sales

Reuters - Business Video Online (July 29, 2014) Pfizer, the world's largest drug maker, cut full-year revenue forecasts because generics could cut into sales of its anti-arthritis drug, Celebrex. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins