Dengue, viral fever, and typhoid all start with high fever — but they are caused by different things, need different tests, and require different treatment. Knowing the key differences can help you act faster and avoid dangerous complications. This guide explains the warning signs of each, which blood test to ask for, and when to see a doctor immediately.
During Hyderabad’s monsoon season (July–October), all three are common — dengue from mosquitoes, typhoid from contaminated water, and viral fevers from person-to-person spread. If your fever has lasted more than 3 days, do not wait to get tested.
Quick Comparison: Dengue vs Viral Fever vs Typhoid
| Feature | Dengue | Viral Fever | Typhoid |
|---|---|---|---|
| Cause | Dengue virus (Aedes mosquito bite) | Various viruses (airborne/contact) | Salmonella typhi bacteria (contaminated food/water) |
| Fever onset | Sudden, very high (103–104°F) | Gradual or sudden, mild to moderate | Gradually rises over 3–5 days |
| Joint/muscle pain | Severe (“breakbone fever”) | Mild to moderate | Mild |
| Headache | Severe, behind the eyes | Mild | Mild to moderate |
| Stomach symptoms | Nausea, vomiting | Mild nausea | Stomach pain, constipation or diarrhoea, coated tongue |
| Rash | Red rash, day 3–5 (50–80% of cases) | Usually none | Rare rose-coloured spots |
| Duration | 7–10 days | 3–7 days | 2–4 weeks if untreated |
| Key blood test | NS1 antigen (days 1–5); Dengue IgM (after day 5) | CBC (usually normal or mildly abnormal) | Widal test, blood culture |
| Treatment | Supportive: paracetamol, fluids, rest | Supportive: rest, fluids, paracetamol | Antibiotics (azithromycin or ceftriaxone) |
Dengue Fever: Symptoms, Tests & Treatment
What is dengue?
Dengue is caused by the dengue virus, transmitted by the Aedes aegypti mosquito. This mosquito bites mainly during the day and breeds in clean, stagnant water — flower pots, water cooler trays, overhead tank lids, and old tyres. In Hyderabad, dengue peaks between July and November, during and after the monsoon.
Dengue symptoms
- Sudden high fever — 103°F to 104°F, coming on within hours
- Severe headache — especially pain behind the eyes (retro-orbital headache)
- “Breakbone” pain — intense muscle and joint pain in the back, arms, and legs
- Rash — flat red rash on day 3–5 (not present in all patients)
- Nausea and vomiting
- Fatigue and weakness — can persist for weeks after recovery
Warning signs of severe dengue — go to hospital immediately
- Bleeding from gums or nose
- Blood in urine, vomit, or stool
- Tiny red or purple spots under the skin (petechiae)
- Severe stomach pain or tenderness
- Persistent vomiting (3 or more times in a day)
- Rapid breathing or difficulty breathing
- Sudden drop in fever with pale, cold, clammy skin
- Extreme restlessness, confusion, or loss of consciousness
Which test confirms dengue?
- NS1 antigen test — most reliable in the first 5 days (detects the virus directly)
- Dengue IgM/IgG antibody test — used from day 5 onwards
- Complete Blood Count (CBC) — low platelet count (below 1,00,000) and low white blood cell count strongly suggest dengue
Important: Do not wait for platelets to drop dangerously low. Get tested on day 2 or 3 if you suspect dengue during monsoon season.
Dengue treatment
There is no specific antiviral drug for dengue. Treatment is supportive:
- Paracetamol for fever and pain — do NOT use ibuprofen, aspirin, or diclofenac (these increase bleeding risk)
- Drink 2–3 litres of fluid daily: ORS, coconut water, buttermilk, soups
- Eat light, easily digestible food: khichdi, curd rice, fruits
- Papaya leaf extract may help support platelet levels — discuss with your doctor first
- Rest completely; avoid any physical exertion
- Daily CBC monitoring if your platelet count is dropping
Viral Fever: Symptoms, Duration & When to Worry
What is viral fever?
“Viral fever” is not a single disease — it is an umbrella term for any fever caused by a viral infection. Common causes include influenza (flu), adenovirus, and rhinovirus. It spreads through coughing, sneezing, and close contact. During Hyderabad’s monsoon, viral fevers spread rapidly in schools, offices, and crowded transport.
Typical symptoms
- Fever — usually 100°F to 102°F
- Runny nose, sore throat, or mild cough
- Mild body aches and fatigue
- Watery eyes
- Occasionally mild nausea
How long does viral fever last?
Most viral fevers resolve within 3 to 7 days with rest, fluids, and paracetamol. If your fever:
- Lasts more than 7 days
- Returns after initially improving (“saddle-back” pattern)
- Is accompanied by severe headache, eye pain, or joint pain
- Comes with stomach pain, constipation, or diarrhoea
- Causes a rash anywhere on the body
…it is likely not a simple viral fever. Get a blood test to rule out dengue or typhoid.
Viral fever treatment
- Rest and plenty of fluids
- Paracetamol for fever (every 6 hours as needed)
- Saline nasal drops for congestion
- Antibiotics are not effective against viral fever and should not be taken without a doctor’s advice
Typhoid Fever: Symptoms, Tests & Treatment
What is typhoid?
Typhoid is a bacterial infection caused by Salmonella typhi. It spreads through food and water contaminated with the bacteria — not through coughing or touch. In Hyderabad, typhoid risk rises during monsoon when flooding can contaminate water supplies. Drinking unfiltered water and eating street food during the rainy season are the main risk factors.
Typhoid symptoms — week by week
Week 1
- Gradually rising fever — starts around 99–100°F, climbs to 103–104°F by end of the week
- Headache and fatigue
- Loss of appetite
Week 2
- Sustained high fever — stays high throughout the day (unlike malaria which spikes and breaks)
- Stomach pain or abdominal tenderness
- Constipation (common in adults) or diarrhoea (more common in children)
- White or yellow coated tongue
- Pulse rate lower than expected for the fever level
Week 3 (if untreated)
- Risk of serious complications: intestinal perforation, internal bleeding, encephalopathy
- Do not let typhoid reach week 3 — it responds well to antibiotics when caught early
Tests for typhoid
- Widal test — quick and widely available, but can give false positives; always interpret with a clinical examination
- Blood culture — gold standard test, most accurate, especially useful in the first week
- Typhidot / Typhifast rapid test — faster than culture, useful in clinic settings
Typhoid treatment
Typhoid requires antibiotics — it will not resolve on its own. Common treatments prescribed by doctors:
- Azithromycin (oral, 5–7 days) — first choice for uncomplicated typhoid in Hyderabad
- Ceftriaxone (injection) — for severe cases or hospitalised patients
- Complete the full antibiotic course even if you feel better after 2–3 days
- Soft, easily digestible diet: khichdi, curd rice, boiled vegetables, bananas
- Avoid spicy, oily, and raw foods until fully recovered
Monsoon Fever in Hyderabad: What’s Driving Cases Right Now
Hyderabad’s monsoon brings a surge in all three conditions every year between July and October. Here’s what’s driving fever cases in Bandlaguda Jagir, Hydershakote, Rajendra Nagar, and surrounding areas during the 2026 monsoon:
- Construction sites and open plots — stagnant water in these areas is the primary breeding ground for Aedes mosquitoes in newer neighbourhoods
- Contaminated water supply — monsoon flooding can mix sewage with drinking water pipes, significantly raising typhoid risk
- School reopening — viral fevers spread quickly in classrooms once children gather after the summer break
- High humidity — creates ideal conditions for both mosquito activity and viral replication
- Check your home weekly for stagnant water — cooler trays, flower pot plates, terrace tanks
- Use mosquito repellent and full-sleeve clothing, especially 6–10 AM and 4–7 PM (peak Aedes biting hours)
- Drink only boiled, filtered, or sealed bottled water
- Wash hands before every meal, especially after coming home from outside
- Avoid street food and cut fruit during monsoon
- Ask your doctor about the typhoid vaccine if you haven’t had one in the last 3 years
When to See a Doctor — Don’t Wait for These Signs
Many patients in Hyderabad wait hoping the fever will pass on its own. See a doctor promptly if:
- Fever lasts more than 3 days
- Temperature is above 103°F
- You have severe headache, pain behind the eyes, or intense body aches
- A rash appears anywhere on the body
- You have stomach pain or repeated vomiting alongside fever
- A child under 5 or an adult over 60 has fever — these groups face higher risk of complications
Early testing saves lives and prevents unnecessary hospitalisations. A single blood test can differentiate between these three conditions within a few hours.
Frequently Asked Questions
What is the main difference between dengue and viral fever?
Dengue is caused by a specific virus carried by Aedes mosquitoes and causes severe joint pain, retro-orbital headache, and low platelet count. Viral fever is a general term for any fever caused by a virus — it is typically milder, shorter, and does not affect platelet counts.
How do I know if I have typhoid or dengue?
Typhoid fever rises gradually over several days with stomach pain and constipation or diarrhoea. Dengue comes on suddenly with intense headache and joint pain. A blood test — NS1 antigen for dengue, Widal test or blood culture for typhoid — confirms the diagnosis. Do not self-diagnose based on symptoms alone.
Can I have dengue without a rash?
Yes. Dengue rash appears in only 50–80% of patients, usually on days 3–5. Its absence does not rule out dengue, especially if you have sudden high fever and severe joint pain during monsoon season.
What blood test confirms dengue fever?
The NS1 antigen test is most reliable in the first 5 days. After day 5, a Dengue IgM antibody test is used. A CBC showing low platelets and low WBC count also supports the diagnosis.
How long does viral fever last?
Most viral fevers last 3–7 days. If fever continues beyond 7 days or new symptoms appear — rash, severe headache, stomach pain — see a doctor. It may be dengue or typhoid rather than a simple viral fever.
What foods should I eat during dengue?
Eat easily digestible foods: khichdi, curd rice, coconut water, papaya leaf juice, pomegranate juice, and light dal. Stay well hydrated with ORS and soups. Avoid oily or spicy food until full recovery.
Is typhoid contagious?
Typhoid spreads through contaminated food and water, not through coughing or touch. Thorough handwashing before meals and drinking only filtered or boiled water are the most effective preventive measures during monsoon.
What are the signs that I need to go to hospital immediately?
Go to emergency if you have bleeding gums or nose, blood in urine or stool, red spots under the skin, severe stomach pain, persistent vomiting, difficulty breathing, or sudden confusion. These signs indicate severe dengue or advanced typhoid requiring urgent medical care.
Which mosquito causes dengue in Hyderabad?
The Aedes aegypti mosquito spreads dengue. It bites during daylight hours and breeds in clean, stagnant water — flower pots, water cooler trays, and open tanks. Eliminating standing water around your home is the single most effective prevention step.
Can I take ibuprofen or aspirin for dengue fever?
No. Only paracetamol is safe for dengue. Ibuprofen, aspirin, and diclofenac thin the blood and can worsen dengue bleeding complications. Always confirm your diagnosis with a qualified doctor before starting any treatment.
Related Reading
- Fever Clinic in Bandlaguda Jagir — Same-Day Consultations
- Cough & Cold Treatment at Suguna Clinic
- Vomiting & Diarrhoea Treatment — When to Seek Help
- Allergy Treatment in Hyderabad
Fever not settling after 3 days?
Suguna Clinic in Hydershakote offers same-day consultations for fever, dengue, typhoid, and viral infections — Monday to Saturday, 9 AM–12 PM and 5 PM–9 PM.