Amaryllis said:
Admitting up front that I haven't been following the bird flu threads very closely, I'm of the understanding that bird flu is not transmittable from person to person. The 1918 flu obviously was person to person so how does this compare, and why would bird flu be of such concern? The people who have been infected have caught it from birds, right?
Lady Amaryllis;
I'll try and answer your question - if I can:
This is from one of the most respected experts in avian flu (H5N1). And WHO as admitted to *limited* transmission, as well....
<B><font color=red><center>Transport of Effient Human Transmission of H5N1 Via S227N</font>
<A href="http://www.recombinomics.com/News/02110601/H5N1_S227N_Transport.html">Recombinomics Commentary</a>
February 10, 2006</center>
"They're all basically the same. Nothing new and unusual,'' Michael Perdue, a scientist with the WHO's global influenza program, said from Geneva.
"That mutation just showed up in that one patient,'' said Perdue.
Genetic analysis of the viruses showed they are closely related to a group or clade of H5N1 viruses that caused a massive die-off of wild birds at a wildlife reserve last May in western China. These Qinghai Lake viruses have been found in dead wild birds in Russia, Turkey, Romania and a number of other spots in western Asia and Eastern Europe.</b>
They are believed to be responsible for Africa's first outbreak of H5N1, in Nigeria.
The above comments concerning the close relationship between a chicken H5N1 isolate in Nigeria and earlier isolates from Qinghai Lake in China and isolates in Turkey and Croatia are of conern. On a recent NPR broadcast it was noted that a string of H5N1 isolates - Turkey, Turkey, Croatia, China, Croatia, Turkey, Croatia, China were between 99.4% and 100% homologous to the chicken isolate from Nigeria. These data leave little doubt that the H5N1 that caused outbreaks at Qinghai Lake in China, Chany Lake, Tula, Kurgen, and Askatran in Russia, Mongolia, Kazakhstan, Romania, Croatia, Bulgaria, Greece, Cyprus, Ukraine, Azerbaijan, Turkey, Iraq, and Nigeria is transmitted and transported by migratory birds carrying closely related H5N1.
However, the comment that the alteration in the receptor binding domain, S227N (also called S223N), described in a sequences from the index case from Turkey is limit to the one patient is clearly misleading. It is well known that isolation of H5N1 in different cell types can alter receptor binding domain sequences and isolation in chicken eggs selects for sequences with avian receptor binding domains. S227N is an alteration that favors receptors on human cells, which leads to more efficient transmission to humans. Media reports on the detection of S227N in the index case in Turkey mentioned isolation of H5N1 from Turkey using chicken eggs as well as MDCK cells (dog kidney). S227N would be selected for on MDCK cells, and selected against in chicken eggs. Thus, isolates from chicken eggs would have reduced levels of S227N.
The data from Turkey, as well as northern and southern Iraq, identified clusters of patients. The size and number of patients indicated H5N1 became more efficient at infecting humans. Prior to Turkey, there were no verified reports of the Qinghai strain infecting humans. In Turkey the human cases exploded, indicating the H5N1 had changed, and the acquisition of S227N was a clear indicator of such a change.
The clusters in northern and southern Iraq indicate that the S227N polymorphisms is transported by wild birds, and the initial reports out of Nigeria suggest it is being carried by long range migratory birds.
Statements by WHO indicating that S227N was limited to the index case require more detail. In the WHO updates on H5N1 positive cases in Turkey, more detail was glaringly absent. Disease onset dates and relations between H5N1 patients were withheld. These data demonstrated extensive human-to-human transmission.
These commissions by omission by WHO are cause for concern.
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<B><font size=+1 color=brown><center>Suspected H5N1 Familial Cluster in Southern Iraq</font>
<A href="http://www.recombinomics.com/News/02090602/H5N1_Iraq_Cluster_South.html">Recombinomics Commentary</a>
February 9, 2006</center>
Three brothers of the Salam family, Karim (three years), Karar (six years) and Mehdi (seven years), who lived in the same house that Mohanad Radi 30 years, were allowed Wednesday in a hospital of Amara, to 365 km in the south of Baghdad, affirmed Mohammad Rikab, director of the department of the infectious disease.</b>
For its part, Sabah Mehdi, which forms part of a delegation of five doctors from Baghdad, to inform itself on the spot of the medical situation, confirmed that the three brothers had the same symptoms as those having preceded death by their cousin.
The above comments describe another familial cluster in Iraq. Mohanad Radi died on Sunday and was a pigeon trader. He appears to be the same person as described in the WHO update as a 13M who died on Sunday. Media reports indicated he was 14 and his name was Mohannad Radhi Zaouri, so there seems to be one fatality in the south, but there is a discrepancy in the age.
The three brothers appear to have developed symptoms after the cousin, suggesting human-to-human transmission. This bimodal distribution of onset dates was also seen in the H5N1 cluster in northern Iraq, as well as the larger clusters in Turkey.
Prior to the cases in Turkey, the Qinghai version of H5N1 had not been confirmed to have infected people. The polymorphism HA S227N was detected in the index case in Turkey. This polymorphism had previously been shown to increase the affinity for human receptors in the respiratory tract and increased efficiency in humans was expected.
The clusters in Turkey as well as northern and southern Iraq indicate that the S227N is being transmitted and transported by wild birds, suggesting that more cases in Iraq and neighboring countries are likely.
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<B><font size=+1 color=green><center>H5N1 Familial Cluster in Amara Iraq Expands</font>
<A href="http://www.recombinomics.com/News/02110604/H5N1_Iraq_Cluster_Amara.html">Recombinomics Commentary</a>
February 11, 2006</center>
The governor of Maysan province told Reuters the suspected bird flu victim was a 24-year-old pigeon seller from Amara who died on Sunday. WHO said earlier that Iraqi officials had identified the victim as a 13-year-old boy.</b>
"He was suffering from constant flu. In hospital he turned worse and began bleeding from both his mouth and nose, and then he died," said Jabbar Zahuri, 38, the dead man's uncle.
The pigeon seller, whom officials identified as Muhaned Radhi, lived in a house with five brothers and eight sisters. Health officials have taken samples from them to test for the virus.
The brother and the sister of a stockbreeder of pigeons of Amara, in the south of Iraq, deceased Sunday after having expressed symptoms of the aviary influenza, were hospitalized Friday, according to the local authorities. "Ali Radi, 10 years, Douaa Radi, 7 years, were allowed today at the hospital because they presented the symptoms of the aviary influenza", affirmed the governor of the province of Missane, Mr. Adel Mohajar Al-Maliki, in a déclarationà the press.
The above media comments describe a growing familial cluster in Amara that has a bimodal disease onset date distribution and represents more efficient human to human transmission of H5N1.
The symptoms of the index case match those of fatal cases in Turkey and northern Iraq. In addition, his pigeons were H5N1 positive. The above indicate three cousins were hospitalized on Wednesday and two siblings were hospitalized on Friday. 11 other siblings are being monitored.
These data indicate H5N1 is efficiently transmitting among family members. The circumstances surrounding the infections of the relatives are not give, but a cluster of six is cause for concern, as is the large number of siblings under observation.
Comments by WHO concerning the inability to find the S227N polymorphisms in any of the Turkey isolates other than the index case are a cause for concern. Although the Qinghai strain of H5N1 has been killing wild and domestic birds since May, there were no confirmed H5N1 human cases associated with this strain until the outbreaks in Turkey. These outbreaks included extremely large familial clusters and signaled a more efficient transmission of H5N1 to humans.
The linkage of S227N, to increased affinity of H5N1 for human receptors is quite clear, and the loss of this linkage as indicated in comments by WHO is cause for concern. The selection away from mammalian receptor bind domain determinants via selection chicken eggs is well known. More details on the “loss” of S227N, as indicated by WHO comments would be useful.
The large size of clusters in Turkey and northern and southern Iraq suggests that the S227N in H5N1 is being transported by wild birds and is functioning efficiently.
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<B><font size=+1 color=blue><center>Suspected H5N1 Familial Cluster in Najaf Iraq</font>
<A href="http://www.recombinomics.com/News/02120602/H5N1_Najaf.html">Recombinomics Commentary</a>
February 12, 2006</center>
2/7 And in Najaf three individuals met from a single family in towards Al Abasia their death yesterday [Feb 06] the effect of doubts with their injury with influenza disease the birds and the Iraqi news agency correspondent in City of Najaf reported that three individuals, two men he exceeds their age the thirty and a woman an old they departed the life affected by a non discovered disease, after their taking before two days a food including the chickens.... [Deaths reported as pneumonia but] ...they will send samples of the deceased blood to Baghdad and hence they send to Egypt to be submitted to accurate analyses.</b>
The above translation suggests another H5N1 familial cluster has been identified in Iraq. These three fatal cases were in the city of Najaf. The victims developed a fatal pneumonia after eating chicken. Samples have been sent out for testing, but testing in Iraq and elsewhere has been problematic at a number of levels for a number of reasons. Testing for H5N1 appears to be getting less reliable, and a diagnosis based on clinical descriptions may be more useful.
The index case in Iraq was "discounted" because of an initial lack of a connection with reported H5N1 infections in birds, although the clinical signs clearly indicated H5N1. In addition, like every index cluster for every country reporting human H5N1 cases since 2005, false negatives were reported. In Turkey, not only are false negatives common, but even positives have tested negative after shipment to Weybridge.
The reliance on lab confirmation has led to delays and a very distorted database of H5N1 infected people. Obvious H5N1 infections are excluded because of lack of samples or poorly collected samples. The current WHO is useful for identifying a full set of clusters, because more have one or more members excluded by lab tests (or lack of lab tests).
The above cluster adds to a growing list of clusters linked to the Qinghai strain of H5N1. The first cluster was reported in Turkey and is easily the longest and largest cluster recorded for H5N1. This first cluster was linked to HA S227N identified in the index case.
The index case was the first confirmed human H5N1 case caused by the Qinghai strain. It seems likely that this change, which increases the affinity of HA in H5N1 for human receptors would create more efficient transmission of H5N1 to humans. This increased efficiency would generate additional clusters, as has been seen in northern and southern Iraq.
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FWIW Lady Amaryllis;
When there are family clusters, there is CAUSE to suspect that the famil members caught the virus from ech other, especially when there is a *time period* between the illnesses with-in that family.