If an allergy test comes back positive, it's decision time: Should you find a new home for your pet?

CNN: What to do if you're allergic to your pet

"It's the first really dramatic advance in 30 years for allergic asthma, " says California-based allergist William Berger , president of the American College of Allergy, Asthma, and Immunology, who helped test the drug.

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With their new laser in hand, Dr Leitgeb and his colleagues set up an experiment that let them test the system on a range of skin conditions, including a healthy human palm, allergy-induced eczema on the forearm, inflammation of the forehead, and two previously diagnosed cases of basal-cell carcinoma.

ECONOMIST: A better way to diagnose skin cancers