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To encourage production of pandemic vaccines, Senators Hillary Rodham Clinton (D-NY) and Pat Roberts (R-Kan.) have introduced legislation, known as the Influenza Vaccine Security Act, that shifts liability from pharmaceutical companies to the federal government for personal injury or death resulting from the manufacture, administration, or use of qualified pandemic influenza technologies.

Perhaps in no area is the divide between the developed and developing worlds as striking as it is for vaccines: While healthcare consumers in economically advantaged nations worry about risk, in developing nations compelling need forces a focus on potential benefit.

As a result, some epidemics, such as the spread of computer viruses and measles, currently rely on random immunization - virtually the entire population is treated.

Rather than simply immunizing random individuals, it might be more effective to treat a random selection of the acquaintances of individuals picked at random.

Many human networks - including some webs of sexual contacts and the Internet - seem to take on a form called , bind the network together.

Hubs are shortcuts between any 2 nodes, giving rise to the small-world effect popularized in the notion of us all being a maximum of six degrees of separation from anyone else.

We argue that ethically, too, this is the right way to go about it.

The Helsinki Declaration suggests that trials be done in populations who are directly to use the drug, and that particular attention must be paid when trials involve vulnerable sectors such as prisoners and those of low socioeconomic status.

It has been reported that it is easy to recruit participants for trials in developing countries, and that the cost of research is halved.

People in the United States want a quick solution, not prevention, so they prefer drugs to vaccines.

Elsewhere, people are afraid of drugs and side effects, and prefer vaccines.

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