A vaccine that could ease asthmatic reactions has been described as "promising" by scientists.
The discovery is being tested at the National Heart and Lung Institute at Imperial College London.

It works by "de-sensitising" asthmatics to the things that trigger their attacks, such as animal fur or dust.

This is done by injecting the patient with tiny amounts of the substance itself.

This technique has been known for some time, but exposing asthmatics to allergens - substances that trigger allergies - has always carried the risk of causing a serious attack.

The London researchers believe they have overcome this problem by modifying the basic ingredients of the vaccine - the protein allergens.

They have divided them into smaller units, which are still recognised by the immune system for the purposes of de-sensitisation, but are less likely to cause a massive attack.

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