Ensure that you drink plenty of water: Egypt has an extremely dry climate most of the year - a fact aggravated by high temperatures in the summer end of the year - and countless travelers each year experience the discomforts and dangers of dehydration. A sense of thirst is not enough to indicate danger - carry a water bottle and keep drinking! Not needing to urinate for a long period or passing very small amounts of dark yellow urine are signs of incipient dehydration.
Egyptian tap water is generally considered safe by locals, but will often make travellers ill. It is not recommended for regular drinking, especially to very local differences in quality. Bottled mineral waters are widely available - see Drink:Water section. Beware of the old scam, however, whereby vendors re-sell bottled water bottles, having refilled with another (perhaps dubious) source... Always check the seal is unbroken before parting with your money (or drinking from it) and inform the tourist police if you catch anyone doing this...
Be a little wary with fruit juice, as some sellers may mix it with water. Milk should also be treated carefully as it may not be pasteurized... Try only to buy milk from reputable shops. Hot beverages like tea and coffee should generally be OK, the water having been boiled in preparation, though it pays to be wary of ice as well.
In order to avoid contracting the rightly dreaded schistosomiasis parasite (also known as bilharzia), a flatworm that burrows through the skin, do not swim in the Nile or venture into any other Egyptian waterways, even if the locals are doing so. It is also a good idea not to walk in bare feet on freshly-watered lawns for the same reason.
Although the disease takes weeks to months to show its head, it's wise to seek medical attention locally if you think you've been exposed, as they are used to diagnosing and treating it, and it will cost you pennies rather than dollars. Symptoms include fever, diarrhea, abdominal pain and fatigue, making the disease easy to mistake for (say) the flu or food poisoning, but the flatworm eggs can be identified with a stool test and the disease can usually be cured with a single dose of Praziquantel.
Outbreaks of Avian Influenza (Bird Flu) in Egypt have led to 23 human fatalities since 2006. The last fatality was in December 2008.
Egypt is generally a safe and friendly country to travel. Egyptians on the whole are very friendly - if you are in need of assistance they will generally try to help you as much as they are able.
Egyptian men will make compliments to women; do not take offense if they do this to you. Men shouldn't be worried, either; if they do this to your partner/daughter, it will be nothing more than a compliment, and hopefully won't go any further than that.
If you are a woman traveling alone or with another woman, be warned that some men will touch you or grab you anywhere on the body, whether you are negotiating with them or simply walking down the street. Dressing modestly will not deter them. Getting upset at them for touching you will be met with amusement by them and any onlookers, both male and female. The best way to avoid this is wear a wedding band and don't be too friendly.
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