Small Steps Against Big Diseases

New vaccines may help thwart Lyme disease and AIDS

In suburbs and rural areas, summer is Lyme-disease season, prompting the flurry of instructions now issuing forth from doctors' offices on how to avoid the illness. It's wise to pay attention: the symptoms can range from joint pain and lethargy in mild cases to debilitating arthritis and even heart damage. But thwarting Lyme disease is not so easy, as anyone knows who has ever searched for the poppy seed-size tick that carries it, or for its unmistakable rash -- which sometimes never appears at all. Tests sometimes don't reveal an infection, and symptoms may not show up for months -- and...

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