Rispondi a: Pandemia influenza suina

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ANSA) – ROMA, 4 OTT – L'Onu lancia l'allarme per l'unione fatale tra il virus dell'influenza A e quello, altamente patogeno, dell'aviaria. ''La nostra preoccupazione – ha avvertito David Nabarro, coordinatore Onu per l'influenza – e' che i due virus si uniscano. La possibilita' c'e' e dobbiamo lavorare per essere certi di essere preparati a questa eventualita'''.Inoltre in questo caso i costi potrebbero essere di molti miliardi di dollari.

ma l'aviaria non era gia nel virus h1n1?

* It is genetically different from the fully human H1N1 seasonal influenza virus that has been circulating globally for the past few years. The new flu virus contains DNA typical to avian, swine and human viruses, including elements from European and Asian swine viruses.

Bottom line: the new flu virus contains DNA from avian, swine viruses (including elements from European and Asian viruses) and human viruses.


“Nell'aprile 2009 ci fu lo scoppio dell'influenza suina in Messico e negli USA, propagatosi velocemente in tutto il mondo trasmettendosi tra uomini. A giudicare dai primi dati pubblicati a maggio, il nuovo tipo A H1N1 dell'influenza è diverso da qualsiasi altro tipo registrato fino a quel momento [1,2].

Si tratta di un'eteroclita combinazione di sequenze di ceppi virali dell'influenza aviaria, umana e suina del Nordamerica e dell'Eurasia. Un eminente virologo di Canberra ha dichiarato ai media che il virus potrebbe essere stato creato in laboratorio e liberato accidentalmente [3]. Alcuni analisti suggeriscono addirittura, senza prove a sostegno, che sia stato creato intenzionalmente come arma biologica [4], mentre altri incolpano l'industria dell'allevamento intensiva e il grande traffico di animali su grandi distanze, che fornisce molte possibilità per la generazione di ricombinanti esotici [5].”

Pandemics of influenza emerge from the aquatic bird reservoir, adapt to humans, modify their severity, and cause seasonal influenza. The catastrophic Spanish H1N1 virus may have obtained all of its eight gene segments from the avian reservoir, whereas the Asian H2N2 and the Hong Kong H3N2 pandemics emerged by reassortment between the circulating human virus and an avian H2 or H3 donor. Of the 16 hemagglutinin subtypes, the H2, H5, H6, H7, and H9 viruses are considered to have pandemic potential. While this chapter focuses on the evolution of the Asian highly pathogenic (HP) H5N1 influenza virus, other subtypes are also considered. The unique features of the HP H5N1 viruses that have devastated the domestic poultry of Eurasia are discussed. Although they transmit poorly to humans, they continue to kill more than 60% of infected persons. It is unknown whether HP H5N1 will acquire human pandemic status; if it does not, another subtype eventually will do so, for a future influenza pandemic is inevitable

Department of Microbiology, Canberra Hospital, Canberra, ACT, Australia. sanjaya.senanayake@act.gov.au

With the recent outbreak of swine influenza, the world may be facing this century's first influenza pandemic. In Mexico, around 2000 patients have been hospitalised with respiratory illness and almost 150 people have died. Several other countries have reported smaller numbers of suspected and confirmed cases of swine influenza. This 2009 influenza A virus is a strain of the H1N1 subtype, and appears to be a human-avian reassortment swine virus influenza. It is likely that sustained human-to-human transmission of swine influenza has occurred, at least in Mexico. Despite there being so many hospitalised patients in Mexico, cases outside Mexico have demonstrated a mild influenza-like illness, with only one fatality to date. In contrast to the 1918 influenza pandemic, we now have a more robust public health system, with widespread global networks; vaccines can be developed rapidly; and there are antiviral medications to which the swine influenza A(H1N1) virus is sensitive. Many resources have been invested in pandemic preparedness programs in the health care and public health systems in Australia over the past few years.

Lindsley F. Kimball Research Institute, The New York Blood Center, New York, NY 10065, USA.

In late April of 2009, a global outbreak of human influenza was reported. The causative agent is a highly unusual reassortant H1N1 influenza virus carrying genetic segments derived from swine, human and avian influenza viruses. In this study, we compared the HA, NA and other gene segments of a swine H3N2 influenza A virus, A/Swine/Guangdong/z5/2003, which was isolated from pigs in 2003 in Guangdong Province, China, to the predominant human and swine H3N2 viruses. We found that the similarity of gene segments of A/Swine/Guangdong/z5/2003 was closer to Moscow/99-like human H3N2 virus than Europe swine H3N2 viruses during 1999-2002. These results suggest that A/Swine/Guangdong/z5/2003 may be porcine in origin, possibly being driven by human immune pressure induced by either natural H3N2 virus infection or use of A/Moscow/10/99 (H3N2)-based human influenza vaccine. The results further confirm that swine may play a dual role as a “shelter” for hosting influenza virus from humans or birds and as a “mixing vessel” for generating reassortant influenza viruses, such as the one causing current influenza pandemic.

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