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Countries in the Americas Observe Vaccination Week05-4-27A Look Behind the Disease: Meningitis05-5-4More Distance on the Road to Ending Polio05-5-11Study: Sunshine and Vitamin D May Improve Lung Cancer Survival05-5-18Study Suggests Laughter Is Good for the Heart05-5-25Study Says Breast-Cancer Treatments Increase Survival Rates05-6-1Work-Related Accidents Increasing in Some Developing Countries05-6-8Number of Americans Living with H.I.V. Estimated Above 1 Million05-6-15Swedish Study Finds That Placebos Can Help Calm Emotions05-6-22W.H.O. Seeks Worldwide Campaign Against Cancer05-6-29Sometimes What Feels Like an Infection May Be an Allergy05-7-6Studies Shows Chemotherapy Improves Lung Cancer Survival05-7-13Studies Show Healthy Living May Lower Risk of Alzheimer's Disease05-7-20SARS Virus No Longer Such a Mystery05-7-27AIDS Scientists Meet in Brazil05-8-3Drugs for Parkinson's Disease Linked to Urges to Gamble05-8-10Lung Cancer: Tobacco Is Usually the Cause, but Not Always05-8-17Scientists Work on a 'Smart Bomb' Against Cancer05-8-24Drug for Other Diseases May Have Use Against AIDS05-8-31India, Nepal Fight Outbreak of Japanese Encephalitis05-9-14Fetal Skin Cells May Treat Burns05-9-21Starting Young to Build a Healthy Heart05-9-28Medical Award Honors Two Scientists Who Found Stem Cells05-10-5Nations Are Urged to Do More Against Risk of Avian Flu05-10-12U.S. Drug Agency Urged to Approve Inhaled Insulin for Diabetics05-10-19Studies Support Wider Use of a Drug for Some Breast Cancers05-10-26United Nations Launches Children's AIDS Campaign05-11-2AIDS Drugs in a Gel May Help Protect Women From H.I.V.05-11-9Measles Campaign Reduces Deaths in African Children05-11-16Cases of 'Katrina Cough' Reported in Cities Hit by Storm05-11-23