When the rain stops and the water slowly drains from the streets, many families in Perambur, Kolathur, Vyasarpadi and nearby areas notice a new problem: someone in the house develops fever. After days of wading through dirty water, a fever with body pain should not be dismissed as a “normal monsoon fever”. Two infections deserve particular attention at this time of year: leptospirosis and typhoid.
This article explains how to recognise the symptoms of each, how doctors confirm the diagnosis, and when it is time to stop waiting at home and see a doctor.
Quick answer: can walking in flood water cause fever?
Yes, it can. Flood water in a city often mixes with sewage and with the urine of rats, dogs and cattle. Leptospirosis is caused by bacteria that spread through such water. The bacteria can enter the body through cuts, scratches, softened skin on the feet, or through the eyes, nose and mouth. Typhoid is different. It spreads when food or drinking water is contaminated, which happens easily when drains overflow and water pipes are damaged.
Both infections can begin with fever, so symptoms alone cannot tell them apart. A doctor’s examination and the right tests are what settle the diagnosis.
What is leptospirosis?
Leptospirosis is a bacterial infection that spreads from animals to humans. Rats are the most common source in cities. The bacteria pass out in animal urine and survive in stagnant water and wet soil. People are usually infected when they walk or work in such water, especially if they have open wounds.Leptospirosis symptoms
The illness often begins suddenly. Common signs include:
- High fever with chills
- Severe headache
- Intense muscle pain, especially in the calves and lower back
- Redness of the eyes without pus or much discharge
- Nausea, vomiting or loose stools
- A skin rash in some people
Many people recover with timely treatment. In a smaller number, the illness becomes serious. Warning signs of the severe form include yellowing of the skin and eyes, very little urine, swelling of the face or legs, breathlessness, coughing blood, or unusual bleeding. This severe form can affect the kidneys, liver and lungs and needs urgent hospital care.
A useful clue is the combination of fever, body pain and red eyes after contact with flood water. If you notice this pattern, do not wait for it to pass.
What is typhoid fever?
Typhoid is caused by a bacterium called Salmonella Typhi. It spreads through food and water contaminated by the faeces of an infected person. After floods, street food, cut fruit, ice and untreated drinking water are common routes of spread.
Typhoid symptoms
Typhoid usually builds up gradually rather than starting suddenly. Common signs include:
- Fever that rises over several days and stays high
- Headache and tiredness
- Stomach pain and discomfort
- Constipation in some people, loose motions in others
- Loss of appetite
- Weakness that lingers
How long does typhoid fever last?
It depends on how early treatment begins. Without proper treatment, the illness can continue for weeks and may lead to complications. With the right antibiotics prescribed by a doctor, most people begin to improve within several days, but weakness can last longer. It is important to finish the full course your doctor prescribes, even after the fever settles. Stopping early can allow the infection to return.
Leptospirosis vs typhoid: how they differ
Feature | Leptospirosis | Typhoid |
How it spreads | Contact with water or soil contaminated by animal urine | Eating or drinking contaminated food and water |
Typical start | Often sudden | Usually gradual |
Distinctive signs | Severe calf pain, red eyes, yellowing in serious cases | Stepwise rising fever, stomach pain, marked weakness |
Key risk after rains | Wading through flood water, especially with cuts | Street food, unsafe water, poor hygiene during water shortages |
Serious complications | Kidney, liver and lung involvement | Intestinal bleeding or perforation, if untreated |
This table is a guide only. The two illnesses overlap, and dengue and malaria are also common after rains. That is why testing matters.
How are these infections diagnosed?
Please do not guess the cause of your fever. A doctor will first ask about your symptoms, when they began and whether you were exposed to flood water or unsafe food. After examining you, the doctor may advise some of the following tests.
For leptospirosis: Blood tests that look for antibodies against the bacteria are commonly used. In the early days of illness, antibodies may not yet have developed, so the doctor may repeat a test later or use a test that detects the bacteria’s genetic material, where available. Kidney and liver function tests, and a complete blood count, help judge how severe the illness is.
For typhoid: A blood culture is considered the more reliable test, ideally done before antibiotics are started. The Widal test is still widely used in India, but its result can be hard to interpret, so doctors read it alongside symptoms and other findings.
To rule out other causes: Tests for dengue and malaria are often done at the same time, because the early symptoms look similar.
How are leptospirosis and typhoid treated?
Both are bacterial infections and are treated with antibiotics chosen and prescribed by a doctor. The right medicine depends on the diagnosis, how unwell the person is, other health conditions, and local resistance patterns. This matters especially for typhoid, where some strains no longer respond to commonly used antibiotics.
Please avoid taking leftover antibiotics or buying them without a prescription. Wrong or incomplete treatment can hide the illness, delay the correct diagnosis and encourage resistant bacteria.
Mild cases may be managed at home with close follow-up, rest and plenty of fluids. Hospital admission may be needed when there is persistent vomiting, dehydration, jaundice, breathing difficulty, reduced urine, bleeding or confusion. Not everyone needs admission, but anyone with these signs should be seen urgently.
When to see a doctor
See a doctor promptly if you have fever after wading through flood water, especially if it comes with body pain, red eyes, vomiting or severe headache. Do not wait for several days to “see if it settles”. Early treatment makes leptospirosis easier to manage.
Seek emergency care immediately if there is:
- Yellow skin or eyes
- Very little or no urine
- Difficulty breathing or coughing blood
- Bleeding from the gums, nose or in the stool
- Severe stomach pain, especially with a swollen or hard abdomen
- Confusion, extreme drowsiness or fainting
- Persistent vomiting with inability to drink fluids
Go directly to the nearest emergency department. Do not delay care while waiting for an appointment.
Practical steps for families in waterlogged areas
If you have to walk through flood water:
- Wear waterproof boots or sturdy footwear where possible.
- Cover cuts and wounds with waterproof dressings.
- Wash your feet and legs with soap and clean water as soon as you reach home, and dry them well.
- Do not rub your eyes or touch your face with wet hands.
- Children should not be allowed to play in stagnant water.
To avoid typhoid and stomach infections:
- Drink boiled or properly filtered water. Boil water for drinking when the supply is doubtful.
- Eat freshly cooked, hot food and avoid raw street food and cut fruit during flooding.
- Wash hands with soap before eating and after using the toilet.
- Keep food covered and store water in clean, closed containers.
- Typhoid vaccination is available. Ask your doctor whether it is suitable for you and your children.
If you have been exposed to flood water: Some health authorities recommend preventive medicine for people at high risk, such as those who worked in flood water for long periods. This should only be taken on a doctor’s advice. Do not start it on your own.
Common misconceptions
“Fever after rain is just a seasonal cold.” Not always. A fever that comes with severe body pain, red eyes, stomach pain or extreme weakness needs medical assessment.
“Paracetamol and rest are enough.” Paracetamol may bring the temperature down, but it does not treat the infection underneath.
“If the fever has gone, the illness is over.” In typhoid especially, fever can ease while the infection remains. Complete the full course your doctor advises.
“Only people with wounds get leptospirosis.” Cuts raise the risk, but the bacteria can also enter through the eyes, nose and mouth, and through skin that has been soaked for a long time.
Fever care at Guru Aadithya Hospital, Perambur
Guru Aadithya Hospital in Perambur is a multispeciality hospital, and its General Medicine department can assess adults and families with post-rain fever, advise on appropriate tests and guide treatment and follow-up. Round-the-clock emergency care is also available for patients who show warning signs.
If you or a family member in Perambur, Kolathur, Villivakkam, Ayanavaram, Vyasarpadi, Otteri or nearby areas has had fever after contact with flood water, you can book a consultation with the General Medicine department.
Book an appointment: [APPOINTMENT LINK / PHONE NUMBER]
For emergencies: Come directly to the emergency department or call [EMERGENCY NUMBER]. Please do not wait for an appointment if warning signs are present.
Questions to ask your doctor
- Could my fever be leptospirosis, typhoid, dengue or something else?
- Which tests do I need, and when should they be repeated?
- Can I be treated at home, or should I be admitted?
- What warning signs should make me return immediately?
- How long should I rest, and when can I return to work or school?
Frequently asked questions
Can walking in rain water cause fever?
Rain water alone is not the main problem. The risk comes when rain water mixes with sewage and animal waste and you walk through it, particularly with cuts on your feet. Fever after such exposure should be checked by a doctor.
What are the first symptoms of leptospirosis?
It usually starts with sudden fever, chills, headache and severe muscle pain, particularly in the calves. Red eyes, nausea and vomiting are also common.
What does fever with body pain and red eyes after rain mean?
It can point towards leptospirosis, especially if you have been in contaminated water. It can also occur with other infections such as dengue, so please see a doctor for tests rather than treating it yourself.
How soon after exposure do symptoms of leptospirosis appear?
Symptoms usually appear after several days, and sometimes after a couple of weeks. This delay is why people often do not connect the illness with the flood water they walked through earlier.
Is typhoid contagious?
Typhoid spreads through contaminated food and water, often from a person who carries the bacteria. Careful handwashing, safe water and hygienic food preparation at home reduce the risk of spreading it to others.
How long does typhoid fever last?
Untreated, it can last for weeks and cause serious complications. With appropriate antibiotics, most people begin improving within several days, though full recovery and energy can take longer.
Can leptospirosis be cured?
Most people recover completely when the illness is diagnosed early and treated with the right antibiotics. Delayed treatment raises the risk of serious complications, so early medical review is important.
Can I take antibiotics at home without seeing a doctor?
No. The right antibiotic depends on the diagnosis, and self-medication can hide symptoms, delay proper treatment and promote resistance.