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Radio Viseu Cidade Viriato

segunda-feira, 4 de maio de 2009

Comfirmado.....

Os resultados das análises feitas a uma mulher portuguesa que esteve no México numa zona infectada com a gripe A confirmaram a contaminação com o vírus H1N1.


Em conferência de imprensa, a ministra da Saúde esclareceu que, apesar desta confirmação, o país não vai alterar a estratégia de combate à propagação do vírus H1N1.


A portuguesa encontra-se bem, segundo a ministra Ana Jorge, e todos os familiares foram acompanhados por uma equipa de vigilância e "nenhum deles apresenta qualquer sintatomatologia".


O teste realizado à paciente pelo Instituto Ricardo Jorge, em Lisboa, foi enviado para os laboratórios certificados da Organização Mundial de Saúde em Londres.


A mulher portuguesa teve já alta hospitalar e está em casa.


HOW SWINE FLU OUTBREAK EMERGED

Flu viruses in different species
Flu viruses mutate over time causing small changes to proteins on their surface called antigens. If the immune system has met a particular strain of the virus before, it is likely to have some immunity; but if the antigens are new to the immune system, it will be weakened.


Flu virus mutation
The influenza A virus can mutate in two different ways; antigenic drift, in which existing antigens are subtly altered, and antigenic shift, in which two or more strains combine. Antigenic drift causes slight flu mutations year on year, from which humans have partial, but not complete, immunity. By contrast, the new strain of H1N1 appears to have originated via antigenic shift in Mexican pigs


Antigenic shift in pigs
The name "swine flu" is a slight misnomer as it is believed pigs acted as a mixing pot for several flu strains, containing genetic material from pigs, birds and humans. Most humans have never been exposed to some of the antigens involved in the new strain of flu, giving it the potential to cause a pandemic.

Virus transmission to humans
The new virus has made the jump from pigs to humans and has demonstrated it can also pass from human to human. This is why it is demanding so much attention from health authorities. The virus passes from human to human like other types of flu, either through coughing, sneezing, or by touching infected surfaces, although little is known about how the virus acts on humans.

Retirado da BBC_NEWS

WHO PANDEMIC ALERT PHASES

Flu viruses in different species
Phase 1: No infections in humans are being caused by viruses circulating in animals.
Flu virus mutation
Phase 2: Animal flu virus causes infection in humans, and is a potential pandemic threat.
Antigenic shift in pigs
Phase 3: Flu causes sporadic cases in people, but no significant human-to-human transmission.
Virus transmission to humans
Phase 4: Human-to-human transmission and community-level outbreaks.
Virus transmission to humans
Phase 5: Human-to-human transmission in at least two countries. Strong signal pandemic imminent.
Virus transmission to humans
Phase 6: Virus spreads to another country in a different region. Global pandemic under way.
Virus transmission to humans
Post-peak: Pandemic activity appears to be decreasing though second wave possible.
Post-pandemic: activity returns to normal, seasonal flu levels.
Retirado da BBC_NEWS


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