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阅读理解（14） A Travellers to developing countries should start with longterm basic health protection. This means vaccinations(疫苗接种) against polio, tetanus and hepatitis A. Other vaccinations will depend on where you are going, local conditions and your possible environment. Visitors to Yellow Fever areas such as West Africa should certainly be vaccinated against it. Check links for the latest news and don't forget your travel insurance. It's really worth the money. Water： In developing countries avoid drinking or even brushing your teeth with tap water. Drink bottled water and check that the cap is well sealed(封闭) when you buy it. Turning it upside down and watching for drops is one method of checking. If you can't buy it, purify it by boiling. Do not take ice in your drinks, unless it is frozen mineral water. Tea, coffee，and soft drinks are fine from the bacteria point of view, though not so fine from a thirst point of view. Don't share water bottles with other travellers unless you want to share their bacteria too. Water filters (过滤器) are OK in theory but can break easily and usually don't filter some serious bacteria, such as hepatitis A and E. Force yourself to drink clean water, lots of it, if you want to avoid headaches and tiredness from a thirst. | 
