Travelers' diarrhea is the most common travel-related ailment. The cornerstone of prevention is food and water precautions, as outlined below. All travelers should bring along an antibiotic and an antidiarrheal drug to be started promptly if significant diarrhea occurs, defined as three or more loose stools in an 8-hour period or five or more loose stools in a 24-hour period, especially if associated with nausea, vomiting, cramps, fever or blood in the stool. A quinolone antibiotic is usually prescribed: either ciprofloxacin (Cipro)(PDF) 500 mg twice daily or levofloxacin (Levaquin) (PDF) 500 mg once daily for a total of three days. Quinolones are generally well-tolerated, but occasionally cause sun sensitivity and should not be given to children, pregnant women, or anyone with a history of quinolone allergy. Alternative regimens include a three day course of rifaximin (Xifaxan) 200 mg three times daily or azithromycin (Zithromax) 500 mg once daily. Rifaximin should not be used by those with fever or bloody stools and is not approved for pregnant women or those under age 12. Azithromycin should be avoided in those allergic to erythromycin or related antibiotics. An antidiarrheal drug such as loperamide (Imodium) or diphenoxylate (Lomotil) should be taken as needed to slow the frequency of stools, but not enough to stop the bowel movements completely. Diphenoxylate (Lomotil) and loperamide (Imodium) should not be given to children under age two.

Most cases of travelers' diarrhea are mild and do not require either antibiotics or antidiarrheal drugs. Adequate fluid intake is essential.

If diarrhea is severe or bloody, or if fever occurs with shaking chills, or if abdominal pain becomes marked, or if diarrhea persists for more than 72 hours, medical attention should be sought.

Though effective, antibiotics are not recommended prophylactically (i.e. to prevent diarrhea before it occurs) because of the risk of adverse effects, though this approach may be warranted in special situations, such as immunocompromised travelers.

Malaria in Somalia: prophylaxis is recommended for all travelers. Either mefloquine (Lariam), atovaquone/proguanil (Malarone)(PDF), or doxycycline may be given. Mefloquine is taken once weekly in a dosage of 250 mg, starting one-to-two weeks before arrival and continuing through the trip and for four weeks after departure. Mefloquine may cause mild neuropsychiatric symptoms, including nausea, vomiting, dizziness, insomnia, and nightmares. Rarely, severe reactions occur, including depression, anxiety, psychosis, hallucinations, and seizures. Mefloquine should not be given to anyone with a history of seizures, psychiatric illness, cardiac conduction disorders, or allergy to quinine or quinidine. Those taking mefloquine (Lariam) should read the Lariam Medication Guide (PDF). Atovaquone/proguanil (Malarone) is a recently approved combination pill taken once daily with food starting two days before arrival and continuing through the trip and for seven days after departure. Side-effects, which are typically mild, may include abdominal pain, nausea, vomiting, headache, diarrhea, or dizziness. Serious adverse reactions are rare. Doxycycline is effective, but may cause an exaggerated sunburn reaction, which limits its usefulness in the tropics.

Long-term travelers who may not have access to medical care should bring along medications for emergency self-treatment should they develop symptoms suggestive of malaria, such as fever, chills, headaches, and muscle aches, and cannot obtain medical care within 24 hours. See malaria for details. Symptoms of malaria sometimes do not occur for months or even years after exposure.

Insect protection measures are essential.

For further information on malaria in Somalia, including a map showing the risk of malaria in different parts of the country, go to the World Health Organization. See also the World Health Organization - Eastern Mediterranean Region.

The following are the recommended vaccinations for Somalia:

Hepatitis A vaccine is recommended for all travelers over one year of age. It should be given at least two weeks (preferably four weeks or more) before departure. A booster should be given 6-12 months later to confer long-term immunity. Two vaccines are currently available in the United States: VAQTA (Merck and Co., Inc.) (PDF) and Havrix (GlaxoSmithKline) (PDF). Both are well-tolerated. Side-effects, which are generally mild, may include soreness at the injection site, headache, and malaise.

Older adults, immunocompromised persons, and those with chronic liver disease or other chronic medical conditions who have less than two weeks before departure should receive a single intramuscular dose of immune globulin (0.02 mL/kg) at a separate anatomic injection site in addition to the initial dose of vaccine. Travelers who are less than one year of age or allergic to a vaccine component should receive a single intramuscular dose of immune globulin (see hepatitis A for dosage) in the place of vaccine.

Typhoid vaccine is recommended for all travelers. It is generally given in an oral form (Vivotif Berna) consisting of four capsules taken on alternate days until completed. The capsules should be kept refrigerated and taken with cool liquid. Side-effects are uncommon and may include abdominal discomfort, nausea, rash or hives. The alternative is an injectable polysaccharide vaccine (Typhim Vi; Aventis Pasteur Inc.) (PDF), given as a single dose. Adverse reactions, which are uncommon, may include discomfort at the injection site, fever and headache. The oral vaccine is approved for travelers at least six years old, whereas the injectable vaccine is approved for those over age two. There are no data concerning the safety of typhoid vaccine during pregnancy. The injectable vaccine (Typhim Vi) is probably preferable to the oral vaccine in pregnant and immunocompromised travelers.

Meningococcal vaccine is recommended for all travelers, especially if prolonged contact with the populace is likely. An outbreak of meningococcal disease which began in October 2001 had resulted in 237 cases and 15 deaths as of March 1, 2002. The outbreak has involved the border zone with Ethiopia near the towns of Hargeisa and Harti Sheikh. See the World Health Organization for details. Meningococcal vaccine has few side-effects. Mild redness at the injection site may occur. Young children may develop transient fever.

Polio immunization is recommended, due to the persistence of polio in sub-Saharan Africa (see "Recent outbreaks" below). Any adult who received the recommended childhood immunizations but never had a booster as an adult should be given a single dose of inactivated polio vaccine. All children should be up-to-date in their polio immunizations and any adult who never completed the initial series of immunizations should do so before departure. Side-effects are uncommon and may include pain at the injection site. Since inactivated polio vaccine includes trace amounts of streptomycin, neomycin and polymyxin B, individuals allergic to these antibiotics should not receive the vaccine.

Yellow fever vaccine is recommended for all travelers over nine months of age. The vaccine is required for all travelers arriving from a yellow-fever-infected country in Africa or the Americas. Yellow fever vaccine (YF-VAX; Aventis Pasteur Inc.) (PDF) must be administered at an approved yellow fever vaccination center, which will give each vaccinee a fully validated International Certificate of Vaccination. The vaccine should not in general be given to those who are younger than nine months of age, pregnant, immunocompromised, or allergic to eggs (since the vaccine is produced in chick embryos). It should also not be given to those with a history of thymus disease or thymectomy. Reactions to the vaccine, which are generally mild, include headaches, muscle aches, and low-grade fevers. Serious allergic reactions, such as hives or asthma, are rare and generally occur in those with a history of egg allergy.

Hepatitis B vaccine is recommended for travelers who will have intimate contact with local residents or potentially need blood transfusions or injections while abroad, especially if visiting for more than six months. It is also recommended for all health care personnel. Two vaccines are currently licensed in the United States: Recombivax HB (Merck and Co., Inc.) (PDF) and Engerix-B (GlaxoSmithKline) (PDF). A full series consists of three intramuscular doses given at 0, 1 and 6 months. Engerix-B is also approved for administration at 0, 1, 2, and 12 months, which may be appropriate for travelers departing in less than 6 months. Side-effects are generally mild and may include discomfort at the injection site and low-grade fever. Severe allergic reactions (anaphylaxis) occur rarely.

Rabies vaccine is recommended only for those at high risk for animal bites, such as veterinarians and animal handlers, and for long-term travelers who may have contact with animals and may not have access to medical care. A complete preexposure series consists of three doses of vaccine injected into the deltoid muscle on days 0, 7, and 21 or 28. Side-effects may include pain at the injection site, headache, nausea, abdominal pain, muscle aches, dizziness, or allergic reactions.

Any animal bite or scratch should be thoroughly cleaned with large amounts of soap and water and local health authorities should be contacted immediately for possible post-exposure treatment, whether or not the person has been immunized against rabies.

Tetanus-diphtheria vaccine is recommended for all travelers who have not received a tetanus-diphtheria immunization within the last 10 years.

Measles-mumps-rubella vaccine: two doses are recommended (if not previously given) for all travelers born after 1956, unless blood tests show immunity. Many adults born after 1956 and before 1970 received only one vaccination against measles, mumps, and rubella as children and should be given a second dose before travel. MMR vaccine should not be given to pregnant or severely immunocompromised individuals.

Cholera vaccine is not generally recommended, even though cholera outbreaks occur regularly, as described below, because most travelers are at low risk for infection. Two oral vaccines have recently been developed: Orochol (Mutacol), licensed in Canada and Australia, and Dukoral, licensed in Canada, Australia, and the European Union. These vaccines, where available, are recommended only for high-risk individuals, such as relief workers, health professionals, and those traveling to remote areas where cholera epidemics are occurring and there is limited access to medical care. The only cholera vaccine approved for use in the United States is no longer manufactured or sold, due to low efficacy and frequent side-effects.

An outbreak of Rift Valley fever was reported in January 2007 from flooded areas in southern Somalia, near the border with Kenya, which was experiencing a major outbreak of the disease. As of February, a total of 114 suspected cases and 51 deaths had been identified in the regions of Gedo, Hiran, Lower Juba (Jubbada Hoose), Middle Juba (Jubbada Dhexe), Lower Shabelle (Shabeellaha Hoose) and Middle Shabelle (Shabellaha Dhexe) (see the World Health Organization and ProMED-mail, January 22, 2007). Rift Valley fever is a viral infection that primarily affects domesticated animals, chiefly sheep, cattle, goats, and camels. The disease is usually transmitted by mosquitoes, but may also be acquired by direct exposure to infected animals or their tissues or by consumption of raw milk. Aerosol transmission has been documented. Most cases occur in those who work with livestock. The incubation period ranges from two to six days. Initial symptoms may include fever, chills, muscle aches, backache, headache, nausea, vomiting, and light sensitivity. Most people recover uneventfully in four to seven days, but the course may be complicated by loss of vision (retinitis), liver inflammation (hepatitis), kidney failure, excessive bleeding (hemorrhage), inflammation of the brain (encephalitis), or death.

Cholera outbreaks occur regularly in Somalia. In Somalia, the number of cholera cases usually peaks each year from December through May, then declines at the beginning of the rainy season. An outbreak was reported in March 2008 from southern Somalia, close to the Kenyan border town of Mandera, where an outbreak was also occurring. A small outbreak was reported from Baidoa Bay in December 2007. A major cholera outbreak was reported in February 2007, initially affecting the central Hiraan area, killing more than 100 people, and the Middle and Lower Shabelle provinces along the Shabelle River, killing at least 115 people. The outbreak spread to Banadir province, particularly Mogadishu, and Gedo province, including the town of Bardhere. An outbreak beginning in March 2002 caused a total of 1191 cases, including 63 deaths. Affected regions included Banadir (Mogadishu), Lower Shabelle (Merka), Middle Shabelle (Jilib and Haranka), Hiraan (Belet Weyne) and Bari (Bossasso). An outbreak beginning in January 2000 resulted in more than 2000 cases and more than 200 deaths, including cases in Bay, Lower Juba, Lower Shabelle, Mogadishu and Mudug. A separate outbreak was reported in October-November 2000 from Boroma, Awdal region, Somaliland, causing more than 200 cases.

The main symptoms of cholera are profuse watery diarrhea and vomiting, which in severe cases may lead to dehydration and death. Most outbreaks are related to contaminated drinking water, typically in situations of poverty, overcrowding, and poor sanitation. Most travelers are at extremely low risk for infection. Cholera vaccine, where available, is recommended only for certain high-risk individuals, such as relief workers, health professionals, and those traveling to remote areas where cholera epidemics are occurring and there is limited access to medical care. All travelers should carefully observe food and water precautions, as below.

An outbreak of poliomyelitis was reported from Mogadishu in July 2005, eventually spreading outside the capital. These represented the first cases of polio in Somalia since 2002. An aggressive series of polio immunization campaigns was undertaken to prevent further spread. No cases have been reported from Mogadishu since November 2005. As of August 2006, the outbreak appeared to be limited to the Mudug region in northeastern Somalia near the Ethiopian border, causing a total of 33 cases for the year. For further information, go to the World Health Organization, NATHNAC, and Global Polio Eradication. As above, a one-time polio booster is recommended for any adult traveler who received the recommended childhood immunizations but never had polio vaccine as an adult. Children should be fully immunized against polio before traveling to Somalia.

An increased number of cases of visceral leishmaniasis (kala-azar) has been reported from southern Somalia in recent years. Visceral leishmaniasis is transmitted by the bite of infected female sandflies. The disease is characterized by fever, weight loss, anemia, and enlargement of the liver and spleen which may develop over months to years. The infection may be especially severe in those with HIV disease. To prevent sandfly bites, follow the same precautions as for mosquito bites, except that netting must be finer-mesh (at least 18 holes to the linear inch) since sandflies are smaller.

Rift Valley fever reached epidemic levels in southern Somalia after torrential rains and severe flooding in late 1997 and early 1998. Cases were reported in the provinces of Gedo, Hiran, and Lower Shabeelle. The outbreak also involved livestock, including sheep, goats, camels and cattle. Rift Valley fever is primarily transmitted by mosquitoes, but may also be acquired by direct contact with infected animals or their tissues. Insect protection measures play an essential role in prevention. (See "An outbreak of Rift Valley Fever, Eastern Africa, 1997-1998"(PDF). Weekly Epidemiological Record, Vol. 73, 15 1998.)

Dengue fever, a flu-like illness sometimes complicated by hemorrhage or shock, may be transmitted by Aedes mosquitoes, which bite primarily in the daytime and favor densely populated areas, though they also inhabit rural environments.

Schistosomiasis may be acquired by swimming, wading, rafting, or bathing in contaminated fresh water. Swimming and bathing precautions are advised (see below).

HIV (human immunodeficiency virus) infection is reported, but travelers are not at risk unless they have unprotected sexual contacts or receive injections or blood transfusions.

Do not drink tap water unless it has been boiled, filtered, or chemically disinfected. Do not drink unbottled beverages or drinks with ice. Do not eat fruits or vegetables unless they have been peeled or cooked. Avoid cooked foods that are no longer piping hot. Cooked foods that have been left at room temperature are particularly hazardous. Avoid unpasteurized milk and any products that might have been made from unpasteurized milk, such as ice cream. Avoid food and beverages obtained from street vendors. Do not eat raw or undercooked meat or fish. Some types of fish may contain poisonous biotoxins even when cooked. Barracuda in particular should never be eaten. Other fish that may contain toxins include red snapper, grouper, amberjack, and sea bass.

All travelers should bring along an antibiotic and an antidiarrheal drug to be started promptly if significant diarrhea occurs, defined as three or more loose stools in an 8-hour period or five or more loose stools in a 24-hour period, especially if accompanied by nausea, vomiting, cramps, fever or blood in the stool. Antibiotics which have been shown to be effective include ciprofloxacin (Cipro), levofloxacin (Levaquin), rifaximin (Xifaxan), or azithromycin (Zithromax). Either loperamide (Imodium) or diphenoxylate (Lomotil) should be taken in addition to the antibiotic to reduce diarrhea and prevent dehydration.

If diarrhea is severe or bloody, or if fever occurs with shaking chills, or if abdominal pain becomes marked, or if diarrhea persists for more than 72 hours, medical attention should be sought.

Wear long sleeves, long pants, hats and shoes (rather than sandals). For rural and forested areas, boots are preferable, with pants tucked in, to prevent tick bites. Apply insect repellents containing 25-50% DEET (N,N-diethyl-3-methylbenzamide) or 20% picaridin (Bayrepel) to exposed skin (but not to the eyes, mouth, or open wounds). DEET may also be applied to clothing. Products with a lower concentration of either repellent need to be repplied more frequently. Products with a higher concentration of DEET carry an increased risk of neurologic toxicity, especially in children, without any additional benefit. Do not use either DEET or picaridin on children less than two years of age. For additional protection, apply permethrin-containing compounds to clothing, shoes, and bed nets. Permethrin-treated clothing appears to have little toxicity. Don't sleep with the window open unless there is a screen. If sleeping outdoors or in an accomodation that allows entry of mosquitoes, use a bed net, preferably impregnated with insect repellent, with edges tucked in under the mattress. The mesh size should be less than 1.5 mm. If the sleeping area is not otherwise protected, use a mosquito coil, which fills the room with insecticide through the night. In rural or forested areas, perform a thorough tick check at the end of each day with the assistance of a friend or a full-length mirror. Ticks should be removed with tweezers, grasping the tick by the head. Many tick-borne illnesses can be prevented by prompt tick removal.

To prevent sandfly bites, follow the same precautions as for mosquito bites, except that netting must be finer-mesh (at least 18 holes to the linear inch) since sandflies are smaller.

Bring adequate supplies of all medications in their original containers, clearly labeled. Carry a signed, dated letter from the primary physician describing all medical conditions and listing all medications, including generic names. If carrying syringes or needles, be sure to carry a physician's letter documenting their medical necessity.Pack all medications in hand luggage. Carry a duplicate supply in the checked luggage. If you wear glasses or contacts, bring an extra pair. If you have significant allergies or chronic medical problems, wear a medical alert bracelet.

Make sure your health insurance covers you for medical expenses abroad. If not, supplemental insurance for overseas coverage, including possible evacuation, should be seriously considered. If illness occurs while abroad, medical expenses including evacuation may run to tens of thousands of dollars. For a list of travel insurance and air ambulance companies, go to Medical Information for Americans Traveling Abroad on the U.S. State Department website. Bring your insurance card, claim forms, and any other relevant insurance documents. Before departure, determine whether your insurance plan will make payments directly to providers or reimburse you later for overseas health expenditures. The Medicare and Medicaid programs do not pay for medical services outside the United States.

Pack a personal medical kit, customized for your trip (see description). Take appropriate measures to prevent motion sickness and jet lag, discussed elsewhere. On long flights, be sure to walk around the cabin, contract your leg muscles periodically, and drink plenty of fluids to prevent blood clots in the legs. For those at high risk for blood clots, consider wearing compression stockings.

Avoid contact with stray dogs and other animals. If an animal bites or scratches you, clean the wound with large amounts of soap and water and contact local health authorities immediately. Wear sun block regularly when needed. Use condoms for all sexual encounters. Ride only in motor vehicles with seat belts. Do not ride on motorcycles.

Medical facilities are extremely limited. Most doctors and hospitals will expect payment in cash, regardless of whether you have travel health insurance. Serious medical problems will require air evacuation to a country with state-of-the-art medical facilities.

Before you leave, make sure you have the names and contact information for physicians, clinics, and hospitals where you can obtain emergency medical care if needed.

All children should be up-to-date on routine childhood immunizations, as recommended by the American Academy of Pediatrics. Children who are 12 months or older should receive a total of 2 doses of MMR (measles-mumps-rubella) vaccine, separated by at least 28 days, before international travel. Children between the ages of 6 and 11 months should be given a single dose of measles vaccine. MMR vaccine may be given if measles vaccine is not available, though immunization against mumps and rubella is not necessary before age one unless visiting a country where an outbreak is in progress. Children less than one year of age may also need to receive other immunizations ahead of schedule (see the accelerated immunization schedule).

Because yellow fever vaccine is not approved for use in children less than nine months of age, children in this age group should not in general be brought to Somalia.

The recommendations for malaria prophylaxis are the same for young children as for adults, except that (1) dosages are lower; (2) Malarone is not recommended for children weighing less than 25 pounds; and (3) doxycycline should be avoided. DEET-containing insect repellents are not advised for children under age two, so it's especially important to keep children in this age group well-covered to protect them from mosquito bites.

When traveling with young children, be particularly careful about what you allow them to eat and drink (see food and water precautions), because diarrhea can be especially dangerous in this age group and because the vaccines for hepatitis A and typhoid fever, which are transmitted by contaminated food and water, are not approved for children under age two. Baby foods and cows' milk may not be available in developing nations. Only commercially bottled milk with a printed expiration date should be used. Young children should be kept well-hydrated and protected from the sun at all times.

Be sure to pack a medical kit when traveling with children. In addition to the items listed for adults, bring along plenty of disposable diapers, cream for diaper rash, oral replacement salts, and appropriate antibiotics for common childhood infections, such as middle ear infections.

Because of the risk of malaria and yellow fever, pregnant women should not in general travel to Somalia. Yellow fever vaccine is not approved for use during pregnancy, because it contains live virus. Malaria may cause life-threatening illness in both the mother and the unborn child. None of the currently available prophylactic medications is 100% effective. Mefloquine (Lariam) is the drug of choice for malaria prophylaxis during pregnancy, but should not be given if possible in the first trimester. If travel to areas with malaria and yellow fever is unavoidable, insect protection measures must be strictly followed at all times. The recommendations for DEET-containing insect repellents are the same for pregnant women as for other adults.

Helpful maps are available in the University of Texas Perry-Castaneda Map Collection and the United Nations map library. If you have the name of the town or city you'll be visiting and need to know which state or province it's in, you might find your answer in the Getty Thesaurus of Geographic Names.

There is no U.S. Embassy in Somalia. U.S. citizens who plan to enter Somalia despite the Travel Warning are urged to register and obtain updated information on travel and security from Embassies in neighboring countries. Travelers to the self-declared "Republic of Somaliland" should register with the U.S. Embassy in Djibouti, and travelers to Puntland or southern Somalia should register with the U.S. Embassy in Nairobi.

The U.S. Embassy in Djibouti is located at Plateau du Serpent, Boulevard Marechal Joffre, Djibouti City; telephone (253) 35-39-95. The after-hours telephone number is (253) 35-13-43. The mailing address is Ambassade Americaine, B.P. 185, Djibouti, Republique de Djibouti. The workweek in Djibouti is Sunday through Thursday. The U.S. Embassy in Nairobi is located on United Nations Avenue, Gigiri, Nairobi, Kenya; telephone (254)(20) 363-6000; facsimile (254)(20) 363-6410. In the event of an after-hours emergency, the Embassy duty officer may be contacted at (254)(20) 363-6170. The Embassy's mailing address is P.O. Box 606 Village Market, 00621 Nairobi, Kenya or mail using U.S. domestic postage may be addressed to Unit 64100, APO AE 09831, USA.

For information on safety and security, go to the U.S. Department of State, United Kingdom Foreign and Commonwealth Office, Foreign Affairs Canada, and the Australian Department of Foreign Affairs and Trade.