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Subject Whooping cough strain now immune to vaccine

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Original Message [link to www.dailytelegraph.com.au]

THE bacteria that causes whooping cough has mutated, eroding the protection provided by the vaccine now given to children, scientists warned yesterday.

University of NSW researchers have identified significant changes in the two most common strains of the bordetella pertussis bacteria, which they also traced back to events in the late 1990s.

Australian children were given a broad-acting "whole cell" vaccination against whooping cough up to 1997, but this was phased out over two years and replaced with a more targeted version.

Concerns over potential side-effects were behind the change to a vaccine with a narrower scope, but this now appears to have contributed to the promotion of resistant strains.

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