The strong broad spectrum antibiotics needed to fight off such infections are also astronomical in price.

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However, if recent research pays off, doctors may be able to add the antiviral equivalent of broad-spectrum antibiotics to their anti-virus arsenals.

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The team had also started several broad-spectrum antibiotics all at once, and this regimen had to be dialled back if they were to avoid breeding resistant bacteria.

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The antibiotics conferring the greatest risk were the broad spectrum variety.

ECONOMIST: Asthma