CDC: Up To 40 Percent Of Americans May Get Ill

U.S. health officials say swine flu could strike up to 40 percent of Americans over the next two years and as many as several hundred thousand could die if a vaccine campaign and other measures aren't successful.

Those estimates from the Centers for Disease Control and Prevention mean about twice the number of people who usually get sick in a normal flu season would be struck by swine flu. Officials said those projections would drop if a new vaccine is ready and widely available, as U.S. officials expect.

The U.S. may have as many as 160 million doses of swine flu vaccine available sometime in October, and U.S. tests of the new vaccine are to start shortly, federal officials said this week.

WBZTV.com: Centers For Disease Control And Prevention Estimates Up To 40 Percent Of Americans May Get Ill

WHO | Pandemic (H1N1) 2009 briefing note 4

The number of human cases of pandemic (H1N1) 2009 is still increasing substantially in many countries, even in countries that have already been affected for some time.

Our understanding of the disease continues to evolve as new countries become affected, as community-level spread extends in already affected countries, and as information is shared globally. Many countries with widespread community transmission have moved to testing only samples of ill persons and have shifted surveillance efforts to monitoring and reporting of trends.

This shift has been recommended by WHO, because as the pandemic progresses, monitoring trends in disease activity can be done better by following trends in illness cases rather than trying to test all ill persons, which can severely stress national resources. It remains a top priority to determine which groups of people are at highest risk of serious disease so steps to best to protect them can be taken.

In addition to surveillance information, WHO is relying on the results of special research and clinical studies and other data provided by countries directly through frequent expert teleconferences on clinical, virological and epidemiological aspects of the pandemic, to gain a global overview of the evolving situation.

WHO | Pandemic (H1N1) 2009 briefing note 4

Al Jazeera English - H1N1 virus spreads to 160 countries

The H1N1 flu virus has spread to at least 160 countries across the world, the World Health Organisation (WHO) has said.

The global virus, which the UN health agency declared a pandemic in June, has resulted in nearly 800 deaths worldwide since it was first detected in Mexico four months ago, WHO officials said in Geneva, Switzerland, on Friday.

'The spread of this virus continues, if you see 160 out of 193 WHO member states now have cases, so we are nearing almost 100 per cent, but not quite yet,' said Gregory Hartl, a WHO spokesman.

'For the moment we haven't seen any changes in the behaviour of the virus,' he said.

'What we are seeing still is a geographic expansion across countries.'

Al Jazeera English - H1N1 virus spreads to 160 countries