Início > Principal > OMS recomenda que a vacina da”gripe sazonal”de 2010 contenha o H1N1

OMS recomenda que a vacina da”gripe sazonal”de 2010 contenha o H1N1

24 de setembro de 2009

A Organização Mundial da Saúde (OMS) recomendou que a vacina contra a gripe sazonal para uso no hemisfério sul, em 2010 contenha o novo  vírus pandêmico H1N1 em vez de uma cepa sazonal H1N1, sinalizando que a estirpe pandêmica substitua definitivamente o vírus sazonal análogo.

A PULMÃO S.A. lembra que as vacinas para gripe contem três sorotipos virais de influenza, sendo 2 influenza tipo A e 1 influenza do tipo B,justamete os capazes de provocar pandemias.E que as escolhas para definição das cepas que serão incluídas para o outono e inverno do ano seguinte costuma ocorrer em setembro/outubro.Esta definição precisa ocorrer agora pois leva meses para que ocorra o desenvolvimento viral, em milhões de ovos necessários para o processo industrial da produção da vacina, adverte o consultor médico da PULMÃO S.A o Dr. Marcos Nascimento.

O vírus pandêmico H1N1 foi a cepa predominante na maior parte do mundo dos casos registrados de gripe até Julho deste ano,admite o relatório da OMS. No Brasil os dados disponíveis até este momento, sugerem que a estirpe pandêmica do novo vírus A (H1N1)  se tornou também predominante.
A cepa pandêmica do vírus H1N1 continua a ser suscetível aos antivirais oseltamivir(Tamiflu®) e Zanamivir(Relenza®), embora alguns casos isolados de resistência tenham sido identificados em pessoas que foram tratadas com o oseltamivir,mas que eram responsivos ao zanamivir.

As três estirpes recomendadas pela OMS para a vacina de 2009 foram:

* Um vírus A H1N1/California/7/2009-like
* Para H3N2, um vírus A/Perth/16/2009-like
* Para B, um vírus B/Brisbane/60/2008-like

Numa nota separada sobre a gripe aviária H5N1, a OMS diz que 37 casos humanos, com cinco mortes, foram confirmados de 1 de fevereiro até  21 de setembro na China, Egito e Vietnã. Um total de 440 casos e 262 mortes foram confirmadas em 15 países desde 2003.

FONTES:

PULMÃO S.A.- Sua Atmosfera, sua Vida!

OMS

ENGLISH VERSION:

WHO picks novel H1N1 for 2010 southern hemisphere flu vaccine

(PULMÃO S.A. News) – The World Health Organization (WHO) has recommended that seasonal influenza vaccines for use in the southern hemisphere next year contain the pandemic H1N1 virus instead of a current seasonal H1N1 strain, signaling that the pandemic strain is expected to push the older H1N1 strains aside.

The WHO also picked a new strain of influenza A/H3N2 for the 2010 Southern Hemisphere vaccine, while keeping the influenza B strain the same. The recommendation means that manufacturers will likely be changing two of the three strains used in the vaccine.

The WHO annually recommends one H1N1, one H3N2, and one B strain for use in seasonal flu vaccines, trying to match the current circulating strains. Because it takes months to grow millions of doses in eggs, the agency makes its choices for the southern hemisphere in September and those for the northern hemisphere in February.

The pandemic H1N1 was the predominant flu strain in much of the world by July of this year, the WHO’s technical report on the strain recommendations notes. In a separate question-and-answer statement, the agency added, “The available data suggest that the pandemic influenza A (H1N1) viruses are becoming much more common than the current seasonal influenza A (H1N1) viruses.

“Although it is impossible to know whether the seasonal influenza A (H1N1) viruses will be completely replaced by the pandemic influenza A (H1N1) virus, the group of experts convened by WHO for this consultation consider it likely that seasonal influenza A (H1N1) will not pose a major public health risk in 2010 in the southern hemisphere.”

The waning seasonal H1N1 strain had become widely resistant to oseltamivir (Tamiflu), the report notes. The pandemic H1N1 virus remains generally susceptible to the antiviral, though a few cases of resistance have been identified in people who were treated with it.

The three recommended flu strains are normally combined in one vaccine, but the WHO said today it was not ready to decide whether the three newly recommended strains should be combined or if separate seasonal and pandemic vaccines should be used next year in the southern hemisphere. The target groups for the seasonal and pandemic strains differ somewhat, particularly regarding older people, who seem to have some protection against the pandemic strain.

“WHO will be in a position to provide guidance on this issue after the Strategic Advisory Group of Experts (SAGE) meets in late October and deliberates on this issue,” the agency said.

The three strains recommended by the WHO today are:

  • An H1N1 A virus/California/7/2009-like virus;
  • For H3N2, an A/Perth/16/2009-like virus;
  • For B, a B/Brisbane/60/2008-like virus.
%d blogueiros gostam disto: