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zoom RSS ブタインフルエンザのより正確な感染流行データが必要/英国 新型インフルエンザ

<<   作成日時 : 2009/07/16 00:50   >>

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 政府は、死亡者数の予測のためには正確な発症分布地図を作製する必要がある。治療が必要な程度の感染者の200人に1人が死亡する可能性があると研究者は言う。ワクチンの準備は予想より遅れており、8月ではなく9-10月にならないと入手できないだろう。
 政府は死因確定手順を早めるために規則改定を考慮している。現時点での推計では季節性インフルエンザと似た毒性で、以前のパンデミックより死亡率はずっと低い。季節性インフルエンザでは良くて1,000人、悪ければ30,000人程度が死亡している。豚インフルエンザの推計でも広い見積もりの許容誤差が必要である。
 重症度の正確な予測がないと秋以降のインフルエンザ流行に対して、必要な情報を医療関係者に提供することが困難となる。
 200人に1人、0.5%という死亡率予測が出されている。当局はこの秋以降の流行時には1日10万人が発症するとしているので、毎日500人が死亡すると推定される。
 あくまで1つの推定であり、高い推計低い推計もでき、現段階では確信できない。英国ではこれまでに17人のブタインフルエンザ関連の死者がでている。
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Page last updated at 23:58 GMT, Tuesday, 14 July 2009 00:58 UK
'Better data needed' on swine flu
http://news.bbc.co.uk/2/hi/uk_news/8150952.stm

画像H1N1 virus
The health secretary says 100,000 a day could contract swine flu

The government must map the spread of swine flu more accurately in order to predict the number of people who are likely to die from it, scientists say.

Researchers at Imperial College say data is vital to ensure the country is "best prepared to fight the pandemic".

They predict that one in 200 people who get swine flu badly enough to need medical help could go on to die.

Meanwhile, the BBC understands that vaccines may not be ready until later than the government had predicted.

Medical correspondent Fergus Walsh said World Health Organisation officials expected the first stocks to be available in September or October, not August as ministers had said.

Chief medical officer Liam Donaldson also told the BBC that to cope with "the height of the pandemic", the government was considering changing the rules to speed up the death certification process for swine flu victims.

"We want to try and reduce as much as possible the burden of work on doctors and we are considering all sorts of things which will help will that," he said.

"That's one of the options that's being looked at."

Margin of error

Accurate predictions about the number of deaths likely to occur from swine flu are not yet available.

We can't be absolutely sure at this stage where the mortality will fall
Sir Liam Donaldson
Chief medical officer

Current estimates suggest it is about as virulent as some types of seasonal flu, but far less deadly than some previous flu pandemics.

The BBC's science editor Susan Watts said in a good year a thousand people die of seasonal flu, but in a bad year it can be 30,000.

Any estimates about swine flu are subject to a wide margin of error, not least because not everyone who catches it develops symptoms.

But despite the difficulties, the Imperial College scientists - who are advising the government on its swine flu strategy - say more accurate mapping of the spread of the virus must be carried out if it is to be effectively managed.

Dr Tini Garske said: "If we fail to get an accurate prediction of severity, we will not be providing healthcare planners, doctors and nurses, with the information that they need to ensure they are best prepared to fight the pandemic as we head into the flu season this autumn."

She said data must be collected "according to well designed study protocols and analysed in a more sophisticated way than is frequently being performed at present".

'Only an estimate'

Not everyone who is infected with swine flu will become ill enough to report their case to a doctor.

Of the proportion who do, scientists predict that 0.5% of them - one in 200 - could go on to die.

Health Secretary Andy Burnham has said there could be 100,000 new cases of swine flu a day later in the year.

If that prediction and the Imperial College figures are both correct, that could mean 500 people dying every day.

There need to be plans for hospitals to share workloads across areas
Prof Steve Field
Royal College of GPs

The chief medical officer told the BBC that was "only an estimate".

"There are higher and lower estimates, we can't be absolutely sure at this stage where the mortality will fall," Sir Liam said.

"Our own estimates show a much broader range than that and a lower figure, but the truth of the matter is it's far too early to say."

There have so far been 17 swine flu-related deaths in the UK.

On Tuesday, a post-mortem examination ruled that a GP who died after contracting it was not killed by the virus.

Prof Steve Field, from the Royal College of GPs, said plans to manage the outbreak were on schedule.

"What we're learning is this is happening in hotspots around the country... so there need to be plans for individual hospitals and for hospitals to share workloads across areas," he said.

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