Typhoid Fever: From Contaminated Water to a Climbing Fever and How to Handle It

What is typhoid fever and how does it spread?

Typhoid fever is a bacterial disease caused by Salmonella Typhi. The bacteria enter the body by mouth through contaminated water or food that has been exposed to the faeces of an infected person. It is classified as a water and sanitation-related disease, and it thrives where drinking water treatment or distribution infrastructure is inadequate.

The most common routes of infection are drinking tap water that has not been adequately treated, eating vegetables or fruit irrigated with contaminated water, and food handled by an infected person who did not wash their hands. Shellfish and seafood taken from polluted waters can also carry the organism. Typhoid does not spread through breathing the same air or ordinary handshaking.

Some people, after recovering from typhoid, continue to carry the bacteria silently in their gallbladder and shed it in their stool without any symptoms. These healthy carriers are a hidden reservoir that sustains transmission in communities with weak water networks, and they may be unaware of their status for years.

What are the symptoms and how do they develop?

What distinguishes typhoid is the way the fever climbs gradually over a full week rather than spiking suddenly. In the first few days the person notices mild headache, fatigue, loss of appetite and generalised muscle aching, with a temperature that may only reach 38 to 38.5 degrees Celsius. By the second week the fever rises to 39 or 40 degrees and stays there, and the feeling of exhaustion intensifies markedly.

In the early stage many patients have constipation rather than diarrhoea, which often surprises people expecting a gastroenteritis-type illness. Diarrhoea is more common in children. The person may also notice a dull pain in the mid or lower abdomen that worsens with pressure, and the spleen and liver sometimes enlarge slightly.

In light-skinned patients, small rose-coloured spots may appear on the trunk, known as rose spots, but they are rarely noticed unless specifically looked for. The headache is persistent and can be severe. The third week carries the highest risk of serious complications, and this is when the outlook without appropriate treatment deteriorates most sharply.

What are the serious complications to know about?

The most dangerous complication is intestinal perforation, occurring in roughly 1 to 3 percent of untreated or late-treated cases. The patient's presentation changes abruptly from a prolonged fever to an acute abdomen with severe pain, board-like rigidity and a sudden spike in temperature. This is a surgical emergency requiring immediate intervention.

Intestinal haemorrhage is another recognised complication and presents with blood in the stool or blood in the vomit. Hepatitis, mild cardiac involvement and clotting disturbances are less common but possible, particularly in immunocompromised patients and the elderly. A 2026 study from Sudan published in Cureus documented the continuing reliance on clinical signs alone in many regional hospitals, which can delay recognition of these complications.

Cases that do not receive appropriate antibiotic treatment can drag on for many weeks and may be fatal. With early and correct treatment, the fatality rate falls to below 1 percent, compared with significantly higher figures in the absence of treatment.

Is the Widal test reliable for diagnosing typhoid?

The Widal test is a blood test that measures antibodies against Salmonella. For decades it has been the most widely used diagnostic test in the region because of its low cost and simplicity. However, a comprehensive Cochrane review published in 2017 concluded that its diagnostic accuracy is insufficient to confirm or rule out typhoid on its own.

The core problem is that this test gives false-positive results in areas where typhoid has previously circulated, because antibodies from previous infections or vaccinations can persist in the blood for years. Other Salmonella species that cross-react with S. Typhi antigens add further confusion. A single positive Widal result does not mean you have active typhoid.

The gold standard is blood culture, where the bacteria are directly detected in the blood during the first week of illness. Sensitivity falls in subsequent weeks while stool and urine cultures become more useful. In areas where culture is not available, the Widal test is used as a supplementary tool alongside clinical findings rather than as definitive proof.

How is typhoid treated, and what about antibiotic resistance?

Typhoid is treated with antibiotics. The most commonly used regimens now include ceftriaxone (Ceftriaxone), which many doctors prefer for its effectiveness against resistant strains, and azithromycin (Azithromycin) as an oral option. The course typically runs from seven to fourteen days depending on severity and the drug used.

A review published in 2011 in the Journal of Infection in Developing Countries documented the rise of strains resistant to first-generation drugs including ampicillin and chloramphenicol, driving updates to treatment guidelines. Extensively drug-resistant typhoid (XDR typhoid), which responds only to azithromycin and a small number of other drugs, emerged in Pakistan and has since spread to several countries.

Do not buy antibiotics from a pharmacy and self-treat on the basis of a positive Widal test alone. Choosing the wrong antibiotic accelerates resistance without curing the disease. If you are managing a mild case at home under medical supervision, drink plenty of fluids and oral rehydration salts, and keep yourself away from preparing food for others until your recovery is confirmed.

In settings affected by medicine shortages, whether because of conflict, supply disruption or poverty, using a partial course or the wrong drug is common. Typhoid treated with inadequate doses tends to return in a more resistant form that is harder and more expensive to cure. Contact any international or local health programme operating in your area if you face difficulty obtaining the correct treatment.

Is there a vaccine and how effective is it?

Yes, typhoid vaccines are available in several forms. The most effective and newest is the typhoid conjugate vaccine (TCV), recommended by the World Health Organization for children from six months of age. A study published in The Lancet in 2024 confirmed this vaccine prevented typhoid in more than 80 percent of recipients over a four-year follow-up period.

The older Vi polysaccharide vaccine is still used to protect travellers to endemic regions and is given as a single dose renewed every three years. It is less effective than TCV especially in young children. An oral live-attenuated vaccine (Ty21a) is available in some countries as an alternative for older children and adults.

The vaccine does not replace food and water precautions. A vaccinated person can still theoretically become infected after ingesting a large dose of the bacteria. Safe water, careful food handling and handwashing remain the first line of defence regardless of vaccination status.

If you live in a country that has introduced TCV into its national programme, or if you have a child under two, ask your doctor or health centre about availability. The older Vi polysaccharide vaccine is also appropriate for adults travelling to endemic regions for work, pilgrimage to Mecca or other purposes, and should be given at least two weeks before departure to allow immunity to develop.

How do you protect yourself and your household?

In areas where the safety of the water supply is uncertain, boil water for a full minute before drinking or use a verified filter or bottled water from a reliable source. Remember that many cases come from ice made with contaminated water or chilled drinks served in restaurants that use unboiled tap water.

Wash your hands with soap and water before preparing food and after using the toilet. Twenty seconds of thorough washing removes a large proportion of organisms from the skin. Vegetables and fruits eaten raw should be washed carefully in clean water or peeled before eating.

If a member of the household has typhoid, they should not prepare food for others, and dedicated clean utensils should be used. Toilets should be disinfected regularly during the illness. The patient may continue to shed bacteria in the stool for weeks after clinical recovery, so hygiene precautions should continue until laboratory clearance is confirmed by a doctor.

In settings where clean water is scarce or infrastructure has been disrupted by conflict, access to boiled or bottled water becomes a medical necessity rather than a preference. Spreading basic handwashing habits within the household, especially before eating and after using the toilet, is one of the lowest-cost and highest-impact steps a family can take to reduce the risk of typhoid circulating among its members.

When should you see a doctor and when is it an emergency?

Any fever lasting more than five days, especially with headache and abdominal discomfort, warrants medical assessment. Do not wait for symptoms to worsen or try home remedies for weeks. Early diagnosis and correct treatment substantially shorten the illness and prevent complications.

At the clinic or hospital you will have blood drawn for culture and a physical examination. Empirical treatment may be started if the clinical picture fits typhoid while culture results are awaited. Severe cases or those with signs of deterioration need hospital admission for intravenous antibiotics and monitoring.

A complication particular to our region is that fever and abdominal symptoms are frequently attributed to other common causes before typhoid is considered. If you are in an endemic area or have recently returned from travel to such a region, tell your doctor explicitly, so typhoid is included in the differential diagnosis from the start.

Typhoid is a notifiable disease in many countries, meaning that confirmed cases should be reported to the public health authorities. If your diagnosis is confirmed, ask the health centre whether reporting is standard practice locally. Tracking the source of an outbreak protects the community: if you and others consumed water or food from a shared source, identifying and removing that source can prevent dozens of further cases.

Sources

• Wijedoru L, Mallett S, Parry CM et al: Rapid diagnostic tests for typhoid and paratyphoid (enteric) fever, The Cochrane database of systematic reviews, 2017
• Swinkels HM, Jenks JD, DeVos E et al: Typhoid Fever, 2026
• Patel PD, Liang Y, Meiring JE et al: Efficacy of typhoid conjugate vaccine: final analysis of a 4-year, phase 3, randomised controlled trial in Malawian children, Lancet (London, England), 2024
• Bhutta ZA, Gaffey MF, Crump JA et al: Typhoid Fever: Way Forward, The American journal of tropical medicine and hygiene, 2018
• Zaki SA, Karande S: Multidrug-resistant typhoid fever: a review, Journal of infection in developing countries, 2011
• Imad Z, Malik MFK, Kalol MMA et al: Clinical Audit of Enteric Fever Diagnostic Practices at Kosti Teaching Hospital: A Retrospective Evaluation, Cureus, 2026