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(Original poster by Shepard Fairey)

Influenza A virus subtype H1N1, also known as A(H1N1), is a subtype of influenza virus A and the most common cause of influenza (flu) in humans. Some strains of H1N1 are endemic in humans, including the strain(s) responsible for the 1918 flu pandemic which killed 50–100 million people worldwide. Less virulent H1N1 strains still exist in the wild today, worldwide, causing a small fraction of all influenza-like illness and a large fraction of all seasonal influenza. H1N1 strains caused roughly half of all flu infections in 2006. Other strains of H1N1 are endemic in pigs and in birds.

In March and April 2009, hundreds of laboratory-confirmed infections and a number of deaths were caused by an outbreak of a new strain of H1N1.

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H1N1 Swine Flu: Barack Obama and the First Deadly Mistake

By Lifegen.de

The H1N1 swine flu hits the US, and for the first time President Barack Obama seems to make a deadly mistake: A disease spread simulation has emphasized that flu interventions must be imposed quickly, if they are to be effective. Researchers writing in the open access journal BMC Public Health have shown that staying at home, closing schools and isolating infected people within the home should reduce infection, but only if they are used in combination, activated without delay and maintained for a relatively long period. The President should have acted by enforcing social separation - but economic items seem to be more important.

What all the President's men should have known: Professor George Milne and his colleagues from the University of Western Australia (UWA) simulated the effect of social distancing on the spread of a flu virus within a small town. Their research used a detailed, individual-based model of a real community with a population of approximately 30,000 (Albany, Australia) using simulation software engineered by UWA’s Dr Joel Kelso. Milne said, “Our results suggest a critical role of combined social distancing measures in the potential control of a future pandemic. Non-pharmaceutical social distancing interventions are capable of preventing less-infectious influenza epidemics and of significantly reducing the rate of development and overall burden of the worst epidemics”.

The research investigated the effects, alone and in combination, of workplace non-attendance, school closure, isolating infected family members inside the home and reducing contact within the wider community. According to Milne, “While such draconian measures seem unlikely to be mandated given their impact on personal freedom, they appear to have a key role to play in delaying the development of a ‘worst case’ influenza epidemic. They may be critical in holding back an epidemic until vaccines are deployed on a sufficient scale that subsequent relaxation of these rigorous measures will not result in a consequential acceleration in the scale of the outbreak”.

The measures described must, however, be employed as soon as possible after the first individuals within the population have been infected, if not preemptively. This study found that, for an outbreak of influenza approximately as infectious as the 1918 Spanish Flu pandemic, the combination of all intervention measures must be introduced within 2 weeks of the first case appearing in a town or city, to prevent an epidemic developing. Delays of 2, 3 and 4 weeks resulted in final attack rates of 7%, 21% and 45% respectively.

Milne concludes, “Social distancing interventions are important as they represent the only type of intervention measure guaranteed to be available against a novel strain of influenza in the early phases of a pandemic. They may be readily activated and thought of as a first line of defence in developing and developed countries alike”.

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