As noted previously, for the clearest, best-informed information on the Mexico influenza outbreak, we don’t listen to or read the mainstream media, we get it from a worldwide network of doctors and researchers. Here’s the latest from ProMed:
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[1] Some questions
Date: Tue 28 Apr 2009
From: Roger Morris
Some questions
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For those of us who are involved in international work on influenza epidemiology and control and responding to the many media enquiries, there is a very large information gap in relation to diagnosis and epidemiology of the Mexican influenza. What is known of the genetic structure of this virus? It has been called a swine flu, but no evidence has been put forward to allow this statement to be evaluated. I have received information that it is a reassortant, which has genetic components from 4 different sources, but nothing official has been released on this. Where does it fit phylogenetically? Is there any genetic variation of significance among the isolates investigated? Would this help to explain the difference in severity of disease between Mexico and other countries?
It is also stated that it should be diagnosed by RT-PCR, without clarifying which PCR. I have received information that the standard PCR for H1 does not reliably detect this virus. Is this true? What is an appropriate series of diagnostic steps for samples from suspect cases? Could we have an authoritative statement on these issues from one of the laboratories, which has been working with the virus?
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Professor Roger Morris
Emeritus Professor of Animal Health
Massey University EpiCentre, PN623
New Zealand
[The genome sequences of several US isolates are now available at GenBank: see . – Moderator CP]
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[2] New Zealand
Date: Tue 28 Apr 2009
Source: Ministry of Health, New Zealand, Media Release [edited]
Results of H1N1 (swine flu) testing
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Director of Public Health, Dr Mark Jacobs announced tonight [28 Apr 2009] that results from some of the Rangitoto College party who tested positive to influenza A on Sunday [25 Apr 2009], have also tested positive for swine flu H1N1.
Results from 3 of the samples were received earlier this evening [28 Apr 2009] from the World Health Organization regional laboratory in Melbourne and all tested positive for the same strain of swine flu. Testing continues on a 4th sample.
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