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If you get sick, you can contact a consular officer at the nearest U.S. embassy or consulate for a list of local doctors, dentists, and medical specialists, along with other medical information. If you are injured or become seriously ill, a consul will help you find medical assistance and, at your request, inform your family or friends. Health Precautions Air pollution abroad may sometimes be severe. Air pollution and high altitudes are a particular health risk for the elderly and persons with high blood pressure, anemia, or respiratory or cardiac problems. If this applies to you, consult your doctor before traveling. In high altitude areas most people need a short adjustment period. If traveling to such an area, spend the first few days in a leisurely manner with a light diet and reduced intake of alcohol. Avoid strenuous activity, this includes everything from sports to rushing up the stairs. Reaction signs to high altitude are lack of energy, a tendency to tire easily, shortness of breath, occasional dizziness, and insomnia. If possible, drink only bottled water or water that has been boiled for 20 minutes. Be aware of ice cubes that may not have been made with purified water. Vegetables and fruits should be peeled or washed in a purifying solution. A good rule to follow is if you can't peel it or cook it, do not eat it. Diarrhea may be treated with antimicrobial treatment which may be prescribed or purchased over the counter. Travelers should consult a physician, rather than attempt self-medication, if the diarrhea is severe or persists several days.