Detection and isolation of H5N1 influenza virus from large volumes of natural water

[sharon sanders]

doi:10.1016/j.jviromet.2008.01.001
Copyright ? 2008 Elsevier B.V. All rights reserved. Short communication

Detection and isolation of H5N1 influenza virus from large volumes of natural water

Alexey Khalenkov^a, W. Graeme Laver^b and Robert G. Webster^a^,^,
^aDepartment of Infectious Diseases, Division of Virology, St. Jude Children's Research Hospital, 332 N. Lauderdale Street, Memphis, TN 38105, USA
^b3047 Barton Highway, Big Pond, Murrumbateman, NSW 2582, Australia
Received 20 August 2007; revised 31 December 2007; accepted 10 January 2008. Available online 5 March 2008.


Abstract

Various species of aquatic or wetlands birds can be the natural reservoir of avian influenza A viruses of all hemagglutinin (HA) subtypes. Shedding of the virus into water leads to transmission between waterfowl and is a major threat for epidemics in poultry and pandemics in humans. Concentrations of the influenza virus in natural water reservoirs are often too low to be detected by most methods. The procedure was designed to detect and isolate low concentrations of the influenza virus in large volumes of water without the need for costly installations and reagents. The virus was adsorbed onto formalin-fixed erythrocytes and subsequently isolated in chicken embryos. Sensitivity of the method was determined using a reverse-genetic H5N1 virus. A concentration as low as 0.03 of the 50% egg infection dose per milliliter (EID₅₀/ml) of the initial volume of water was effectively detected. The probability of detection was

13%, which is comparable to that of detecting the influenza virus M-gene by PCR amplification. The method can be used by field workers, ecologists, ornithologists, and researchers who need a simple method to isolate H5N1 influenza virus from natural reservoirs. The detection and isolation of virus in embryonated chicken eggs may help epidemiologic, genetic, and vaccine studies.



http://www.sciencedirect.com/scienc...serid=10&md5=286bf61fc060e9eac2043567bf5eedd0

 

[gsgs]

Re: Detection and isolation of H5N1 influenza virus from large volumes of natural water

assume one swan on a 10mx10m lake with a dropping
of 1cm^2 which dissolves on the surface.
If the dropping has EID_50, then the solution has
only 1/1million of this. Seems too low.
Or do they sink ?
Better try to collect many droppings with a net or from the ground
and then mix them and analyze them all at once (?)

 

[Sally Furniss]

Re: Detection and isolation of H5N1 influenza virus from large volumes of natural water

Or do they sink ?

They sink.