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Flu Scan for Jan 24, 2014
H7N9 transmission in songbirds; Possible 1918 pandemic origin
Filed Under:
H7N9 Avian Influenza;Avian Influenza (Bird Flu); Pandemic Influenza
Study shows songbirds might aid in H7N9 spread
H7N9 avian flu replicates well in finches, sparrows, and parakeets experimentally inoculated with the pathogen, and the birds shed the virus in high numbers and show few signs of disease, scientists reported today in Emerging Infectious Diseases.
Researchers from St. Jude Children's Research Hospital in Memphis, Tenn., and from China and Hong Kong inoculated groups of zebra finches, society finches, parakeets, and house sparrows with the H7N9 virus either intranasally, intraocularly, or orally and housed them with birds that were not inoculated (contact birds).
All inoculated birds shed virus, but only via the beak and not via the cloaca (anus). Shedding levels were highest in the two finch species, which shed virus for 6 days. Parakeets also shed virus for 6 days, while the sparrows shed virus for 4 days.
All species of birds were susceptible to H7N9 infection, but only one sparrow showed signs of clinical disease: lethargy, loose and discolored feces, and ruffled feathers.
Contact finches and sparrows showed evidence of H7N9 infection, but only one infected contact finch shed high levels of the virus. The contact parakeets did not become infected.
The authors conclude, "Our demonstration that parakeets and multiple species of songbirds are susceptible to influenza A(H7N9) virus isolated from humans during the recent outbreak in China further supports the possible contribution of songbirds and parakeets to the ecology, maintenance, and transmission of novel A(H7N9) viruses."
Jan 24 Emerg Infect Dis study
. . .
Jones JC, Sonnberg S, Ko?er ZA, Shanmuganatham K, Seiler P, Shu Y, et al.
Possible role of songbirds and parakeets in transmission of influenza A(H7N9) virus to humans.
Emerg Infect Dis [Internet]. 2014 Mar [date cited]. http://dx.doi.org/10.3201/eid2003.131271
DOI: 10.3201/eid2003.131271
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<tr style="float: center;"><td style="font-size: 140%; font-weight: bold;">Possible Role of Songbirds and Parakeets in Transmission of Influenza A(H7N9) Virus to Humans
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<tr style="float: center;"><td style="font-size: 90%;">Songbirds are common household pets and are in close contact with humans and domesticated animals. Their wild counterparts also are likely to interact with poultry in backyard farms and in many farming sectors (14,15).
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<tr style="float: center; font-size: 60%;"><td>By Jeremy C. Jones, Stephanie Sonnberg, Zeynep A. Ko?er, Karthik Shanmuganatham, Patrick Seiler, Yuelong Shu, Huachen Zhu, Yi Guan, Malik Peiris, Richard J. Webby, and Robert G. Webster</td></tr>
<tr style="float: center; font-size: 60%;"><td><a href="http://wwwnc.cdc.gov/eid/" target="_blank">EID Journal</a>
Volume 20, Number 3?March 2014 Ahead of Print
January 24, 2014</td></tr>
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<span style="font-family: Georgia, Times New Roman, serif; font-size: 100%;">'Abstract Extract:
"Our study demonstrates that a human isolate can replicate in and be shed by such songbirds and parakeets into their environment. This finding has implications for these birds? potential as intermediate hosts with the ability to facilitate transmission and dissemination of A(H7N9) virus."'
Re: China - H7N9 Human Isolates on Deposit at GISAID
Novel Genetics
in Guangdong Child November 2013
<span style="font-size: x-small;"><em>Sequences discussed in this analysis are variously stored publicly at GenBank and at GISAID. We gratefully acknowledge the authors, originating and submitting laboratories of the sequences from GenBank and from GISAID?s EpiFlu? Database on which this research is based. </em></span>
<span style="font-size: small;">
Publish Date : 2014-01-04
Last Update : 2014-01-04</span>
On 2013-12-25, the <span style="color: #783f04;"><b>Guangdong CDC</b></span> released a sequence at <strong>GenBank </strong>from a recent <strong><span style="color: #660000;">Emergent H7N9</span></strong> case sampled from a 3 year old male child (FluTrackers Case #139) on November 4, 2013. This sequence provides a fourth concurrent novel gene constellation in present human circulation. Emergent H7N9 is very active genetically .
The <b><span style="color: #274e13;">Hemagglutinin</span></b> resembles the most recent Guandgong case [Deposit Report] with the antigenic HA128A, but has dropped the HA277D creating yet another novel <strong><span style="color: #660000;">Emergent H7N9</span> <b><span style="color: #274e13;">Hemagglutinin</span></b></strong>. The transmission of <b><span style="color: #274e13;">HA</span></b> <b><span style="color: blue;">128A</span></b>, an antigenic revision from the circulating <b><span style="color: #783f04;">human</span></b> seasonal H3N2 that set <b><span style="color: #660000;">Hospitalisation and Fatality</span></b> <b>records</b> <a href="http://www.flutrackers.com/forum/showthread.php?p=491951#post491951" target="_blank">last season</a>, merits close examination for human infectivity.
From the four most recent human sequence deposits of <strong><span style="color: #660000;">Emergent H7N9</span></strong>, four different sequence beds are in concurrent transmission with interplay.
The Polymerase constellation is novel and again strikingly divergent from the Fall 2013 human cases. The novelPolymerase Acidic (PA) of this child does not resemble the first Guangdong case, but is does share sporadic homology with the recent human Hong Kong case [Deposit Report]. H5N1Fatalities in Asia also share features of this Guangdong child's PA segment. The ReAssortedPolymerase Basic 1 (PB1) from the first Guangdong case is maintained, but with reversion at the drop of a rarePB1374V. The ReAssortedPolymerase Basic 2 (PB2) from the first Guangdong case is also maintained, but with the novelty addition of 3 amino polymorphisms. Oddly, after gaining 3 revisions, PB2 in this human child then reverts to the avian base at <b><span style="color: blue;">627E</span></b>.
Re: China - H7N9 Human Isolates on Deposit at GISAID
<span style="font-size: x-small;"><em>Sequences discussed in this analysis are variously stored publicly at GenBank and at GISAID. We gratefully acknowledge the authors, originating and submitting laboratories of the sequences from GenBank and from GISAID’s EpiFlu™ Database on which this research is based. </em></span>
<span style="font-size: small;">
Publish Date : 2014-01-04
Last Update : 2014-01-04</span>
On 2013-12-31, the <span style="color: #783f04;"><b>Jiangsu CDC</b></span> released a set of sequences at <strong>GenBank </strong>from ten early <strong><span style="color: #660000;">Emergent H7N9</span><span style="color: #4c1130;"> </span></strong>human cases and 2 related environmental samples.
GeneWurxrNr Analytics have been updated to delineate differences between the Antigens (HA & NA) and the Polymerase Complexes for these two recent human Emergent H7N9 sequences.
The two alternate ReAssortments are detailed and contrasted at Emergent H7N9 Genetics.
First Guangdong Human Case Acquires Antigenic H3N2 HA128A
A/Guangdong/1/2013
HA_: Emergent H7N9 Novel
NA_: Emergent H7N9 Standard
PB2: H9N2
PB1: H9N2
PA_: Emergent H7N9 Novel
First Hong Kong Human Case, 36F, Repeats H3N2 Antigenic HA128A
A/Hong Kong/5942/2013
HA_: Emergent H7N9, Similar, but NOT Matched, to Guangdong
NA_: Emergent H7N9 Novel
PB2: H9N2 ReAssort, Similar, but NOT Matched, to Guangdong
In plain English, for non-scientific people, can you explain the ramifications of your recent posts please? Thanks!
Emergent H7N9 Promiscuity Leads to Genetic Instability
Among the most recent human cases, at least three distinct strains of Emergent H7N9 have been detected in humans from the late Summer and throughout the Fall of 2013 (the second phase of Emergence).
HyperAssortment appears to be the norm with an emphasis at the segments of the Polymerase Complex. Beyond the increased ReAssortment activity, Single Nucleotide Polymorphisms (SNPs) are entering the H7N9 reservoir that have also occurred during Host-Switching (zoonosis / animals to people) in currently circulating human influenza such as Pandemic H1N1 2009 and Seasonal H3N2. The aggressive nature of this HyperMorphic behaviour suggests a viral reservoir that allocates resources to Host-Seeking mode.
On the segments that are considered Antigenic (included in Vaccine Designs), those SNP revisions, "Tried-and-True" in circulating human serotypes, continue to create Emergent H7N9 novelty. That Emergent H7N9 novelty, in turn, differentiates the currently transmitting disease from the genetics of the February / March 2013 early strains and the vaccine target.
During the emergence of Pandemic H1N1, that viral reservoir exhibited a similar series of distinguishment stages, at times with up to 7 distinct transmitting backgrounds and fatality on multiple contemporaneous backgrounds. While H7N9 is NOT in a pandemic phase, the reservoir does presently exhibit the characteristics of bi-directional promiscuity and genetic signals of active Host-Seeking behaviour.
The Open Access, Full Text studies at Emergent H7N9 Genetics and pH1N1 Genetics describe notable scenarios that underlie this synopsis of Emergent H7N9 promiscuity leading to genetic instability.
Re: China - H7N9 Human Isolates on Deposit at GISAID
GeneWurxrNr Analytics have been updated to delineate differences between the Antigens (HA & NA) and the Polymerase Complexes for these two recent human Emergent H7N9 sequences.
The two alternate ReAssortments are detailed and contrasted at Emergent H7N9 Genetics.
First Guangdong Human Case Acquires Antigenic H3N2 HA128A
A/Guangdong/1/2013
HA_: Emergent H7N9 Novel
NA_: Emergent H7N9 Standard
PB2: H9N2
PB1: H9N2
PA_: Emergent H7N9 Novel
First Hong Kong Human Case, 36F, Repeats H3N2 Antigenic HA128A
A/Hong Kong/5942/2013
HA_: Emergent H7N9, Similar, but NOT Matched, to Guangdong
NA_: Emergent H7N9 Novel
PB2: H9N2 ReAssort, Similar, but NOT Matched, to Guangdong
Re: China - H7N9 Human Isolates on Deposit at GISAID
Discussion on the Notable Absence of Mention: Ongoing 2013 H7N3 Outbreak throughout Mexico
Morens DM, Taubenberger JK, Fauci AS. 2013. H7N9 Avian Influenza A Virus and the Perpetual Challenge of Potential Human Pandemicity. mBio 4(4):e00445-13. doi:10.1128/mBio.00445-13.
Re: China - H7N9 Human Isolates on Deposit at GISAID
Discussion of Alternate Surveillance Methods to protect the public from Pandemic Disease when UnTrustworthy Primary Sources Force Indirect Measurements.
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