Giuseppe
Emeritus
[Source: US National Library of Medicine, (LINK). Edited.]
J Gen Virol. 2010 May 12. [Epub ahead of print]
Phenotypes influencing transmissibility of highly pathogenic avian influenza viruses in chickens.
Suzuki K, Okada H, Itoh T, Tada T, Tsukamoto K. - National Institute of Animal Health, Japan;
To identify critical phenotypes affecting avian influenza virus transmission in chickens, we compared the transmissibility of three H5N1 highly pathogenic viruses of different pathogenicity in chickens by monitoring the exact time of death using wireless thermo-sensors. This study showed that, despite quick deaths, the most virulent H5N1 A/chicken/Yamaguchi/7/2004 transmitted quickly in chickens via contact and airborne routes. Intermediate virulent H5N1 A/chicken/Miyazaki/K11/2007 spread moderately and less virulent H5N1 A/duck/Yokohama/aq10/2003, causing severe clinical signs and a long period to death, spread slowly among the animals. The transmissibility was correlated with virus titers of oropharyngeal and cloacal swabs, and the time for swab virus titers to reach 50% chicken infective dose affected the transmission speed. These results demonstrated that peak virus titers excreted and the time required for virus titers to reach a minimal chicken infectious dose may be the critical phenotypes influencing the transmissibility of highly pathogenicity avian influenza viruses in chickens.
PMID: 20463150 [PubMed - as supplied by publisher]
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J Gen Virol. 2010 May 12. [Epub ahead of print]
Phenotypes influencing transmissibility of highly pathogenic avian influenza viruses in chickens.
Suzuki K, Okada H, Itoh T, Tada T, Tsukamoto K. - National Institute of Animal Health, Japan;
To identify critical phenotypes affecting avian influenza virus transmission in chickens, we compared the transmissibility of three H5N1 highly pathogenic viruses of different pathogenicity in chickens by monitoring the exact time of death using wireless thermo-sensors. This study showed that, despite quick deaths, the most virulent H5N1 A/chicken/Yamaguchi/7/2004 transmitted quickly in chickens via contact and airborne routes. Intermediate virulent H5N1 A/chicken/Miyazaki/K11/2007 spread moderately and less virulent H5N1 A/duck/Yokohama/aq10/2003, causing severe clinical signs and a long period to death, spread slowly among the animals. The transmissibility was correlated with virus titers of oropharyngeal and cloacal swabs, and the time for swab virus titers to reach 50% chicken infective dose affected the transmission speed. These results demonstrated that peak virus titers excreted and the time required for virus titers to reach a minimal chicken infectious dose may be the critical phenotypes influencing the transmissibility of highly pathogenicity avian influenza viruses in chickens.
PMID: 20463150 [PubMed - as supplied by publisher]
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