Featured Research

from universities, journals, and other organizations

Human-to-Human Transmission Possible In Latest Outbreak Of Avian Influenza, WHO Reports

Date:
February 2, 2004
Source:
World Health Organization
Summary:
In the current family cluster of cases in Viet Nam, WHO considers that limited human-to-human transmission, from the brother to his sisters, is one possible explanation. The investigation failed to reveal a specific event, such as contact with infected poultry or an environmental source, that might explain the source of infection in these cases.

Laboratory tests have confirmed an additional 2 cases of human infection with H5N1 avian influenza in Viet Nam. Both have died.

The two deaths announced today were in sisters, aged 23 and 30 years. Both women fell ill on 10 January, were admitted to hospital on 13 January, and died on 23 January. The results from initial local testing of these two cases were inconclusive. Today’s official confirmation follows more extensive testing at a WHO influenza reference laboratory in Hong Kong.

Altogether, 10 cases of human infection with H5N1 avian influenza have been confirmed in Viet Nam. Of these 10 cases, 8 have died, one has recovered and one remains in hospital.

Investigation of a family cluster

The two sisters who died are part of a cluster of four cases of severe respiratory illness in a family from Thai Binh province. The cluster includes the two sisters, their brother, and his wife, who has fully recovered. The brother was hospitalized in Hanoi with a severe respiratory illness on 7 January and died on 12 January. No samples were available for testing.

A detailed investigation of this cluster has been undertaken by WHO, Viet Nam’s National Institute of Hygiene and Epidemiology, and local health officials.

To date, the investigation has not been able to conclusively identify the source of infection for the two sisters. With the exception of this family cluster, all human cases in the Viet Nam outbreak have been linked to contact with infected poultry.

In Hong Kong in 1997, extensive studies, using both molecular and epidemiological data, eventually linked all 18 cases of human H5N1 infection to contact with live infected poultry.

In addition to these 18 cases, WHO notes that laboratory evidence indicated very limited human-to-human transmission during the H5N1 outbreak in Hong Kong, and during a 2003 outbreak of highly pathogenic H7N7 avian influenza in the Netherlands. However, no cases of severe disease in humans occurred as a result of this very limited secondary transmission.

In the current family cluster of cases in Viet Nam, WHO considers that limited human-to-human transmission, from the brother to his sisters, is one possible explanation. The investigation failed to reveal a specific event, such as contact with infected poultry or an environmental source, that might explain the source of infection in these cases. However, as H5N1 infection in poultry is widespread in Viet Nam, direct transmission from poultry to humans cannot be entirely ruled out on the basis of available evidence.

At present, no evidence indicates that efficient human-to-human transmission is occurring in Viet Nam or elsewhere. WHO and health authorities in Viet Nam and globally are continuing to assess the outbreak in terms of its epidemiological evolution. Human cases are being investigated to identify the source of infection, and evidence to date is reassuring.

WHO teams are supporting national investigations in Viet Nam and Thailand, and will arrive soon in other countries that have requested such support.


Story Source:

The above story is based on materials provided by World Health Organization. Note: Materials may be edited for content and length.


Cite This Page:

World Health Organization. "Human-to-Human Transmission Possible In Latest Outbreak Of Avian Influenza, WHO Reports." ScienceDaily. ScienceDaily, 2 February 2004. <www.sciencedaily.com/releases/2004/02/040202073047.htm>.
World Health Organization. (2004, February 2). Human-to-Human Transmission Possible In Latest Outbreak Of Avian Influenza, WHO Reports. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2004/02/040202073047.htm
World Health Organization. "Human-to-Human Transmission Possible In Latest Outbreak Of Avian Influenza, WHO Reports." ScienceDaily. www.sciencedaily.com/releases/2004/02/040202073047.htm (accessed July 29, 2014).

Share This




More Plants & Animals News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deadly Ebola Virus Threatens West Africa

Deadly Ebola Virus Threatens West Africa

AP (July 28, 2014) West African nations and international health organizations are working to contain the largest Ebola outbreak in history. It's one of the deadliest diseases known to man, but the CDC says it's unlikely to spread in the U.S. (July 28) Video provided by AP
Powered by NewsLook.com
Traditional African Dishes Teach Healthy Eating

Traditional African Dishes Teach Healthy Eating

AP (July 28, 2014) Classes are being offered nationwide to encourage African Americans to learn about cooking fresh foods based on traditional African cuisine. The program is trying to combat obesity, heart disease and other ailments often linked to diet. (July 28) Video provided by AP
Powered by NewsLook.com
Asteroid's Timing Was 'Colossal Bad Luck' For The Dinosaurs

Asteroid's Timing Was 'Colossal Bad Luck' For The Dinosaurs

Newsy (July 28, 2014) The asteroid that killed the dinosaurs struck at the worst time for them. A new study says that if it hit earlier or later, they might've survived. Video provided by Newsy
Powered by NewsLook.com
Raw: Sea Turtle Hatchlings Emerge from Nest

Raw: Sea Turtle Hatchlings Emerge from Nest

AP (July 27, 2014) A live-streaming webcam catches loggerhead sea turtle hatchlings emerging from a nest in the Florida Keys. (July 27) Video provided by AP
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