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Avian influenza virus in mammals spreads beyond the site of infection to other organ systems

Researchers at Erasmus Medical Center have demonstrated systemic spread of avian influenza virus in cats infected by respiratory, digestive, and cat-to-cat contact. The paper by Rimmelzwaan et al., "Influenza A virus (H5N1) infection in cats causes systemic disease with potential novel routes of virus spread within and between hosts," appears in the January issue of The American Journal of Pathology and is accompanied by a commentary.

Avian influenza (H5N1) is of great concern because of the current outbreaks in Asia and the potential for pandemic spread. This virus is highly contagious in birds and spreads easily due to the agricultural and migratory nature of the bird species infected, including poultry, water fowl, and other migratory species (See commentary by Brown for more information). While spread of avian influenza from bird to man is known to occur, as first reported during the 1997 Hong Kong outbreak, human-to-human spread is extremely rare. Thus, the disease events that take place during mammal-to-mammal spread are not well characterized.

To assess the spread of H5N1 influenza virus in mammalian hosts, Rimmelzwaan et al. examined cats infected via the respiratory tract, via the digestive tract (by feeding on infected chicks), or by close contact with respiratory-infected cats. The researchers, led by Dr. Thijs Kuiken, then examined mucous membranes (throat, nasal, and rectal swabs) and organ systems (respiratory, digestive, nervous, cardiovascular, urinary, lymphoid, and endocrine) for the presence of virus and viral protein.

As expected, all cats were infected with H5N1 virus and exhibited clinical signs of disease (fever, lethargy, labored breathing, etc.), and virus was detected in throat, nasal, and rectal swabs, regardless of the original site of infection. Most interesting, virus spread throughout the organ systems with virus being found in respiratory and digestive tracts, liver, kidney, heart, brain, and lymph node
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Source:American Journal of Pathology


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