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Immunotherapy · Monsoon & Seasonal Illness
Monsoon, Dengue and Seasonal Illness During Treatment — What to Watch, What to Do
Every monsoon in Telangana, dengue, viral fever, typhoid and stomach infections rise for everyone. Immunotherapy does not usually make you catch them more easily. What it does change is how a fever must be read, because an immune reaction to treatment can look almost exactly like a seasonal fever in the first two days. This page sets out what genuinely raises the risk, how the two are told apart, and what to do the day a fever starts.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- Your immunity is not simply "low" — immunotherapy activates the immune system rather than suppressing it, so it does not usually raise your chance of catching dengue or a monsoon virus.
- Steroid medicine is the real exception — if an immune reaction is being treated with steroids, infection risk does rise and monsoon precautions tighten for that period.
- Never assume a fever is "just viral" — seasonal illness and an immune reaction overlap in the first 48 hours, so every fever gets a same-day call, not a wait-and-watch.
- Dengue is prevented at home — the mosquito that carries it breeds in clean stored water and bites in daylight, so weekly emptying of coolers, drums and plant trays matters more than avoiding people.
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A fever of 100.4°F (38°C) or higher during immunotherapy is a same-day call — never a wait-and-see.
Call the helpline the same day, before giving any medicine bought at the chemist. Do not wait for the fever to settle overnight and do not assume it is only the season. Go to the nearest emergency department now, and say the words "on immunotherapy", if there is severe stomach pain, repeated vomiting, bleeding from the gums or nose, black stools, new breathlessness, chest pain, or if the patient is unusually drowsy, confused or restless. Those are World Health Organization dengue warning signs and they are also how several serious immune reactions announce themselves — either way they are an emergency, not a home problem.
The short answer
Is my risk of dengue or viral fever higher during immunotherapy?
Usually no. Immunotherapy activates your immune system rather than suppressing it. On immunotherapy alone, your chance of catching dengue, influenza or a monsoon stomach infection is broadly the same as anyone else living in your house. This is the opposite of what most families assume, and the assumption causes real harm — people stop stepping out, stop working and stop attending functions for a risk that is not actually there.
The exceptions are specific and worth checking against your own situation. Risk does rise if you are taking steroid medicine to settle an immune reaction, if chemotherapy is being given alongside immunotherapy, if your blood counts are low for another reason, or if diabetes or another long-term illness is poorly controlled.
What changes for everyone on immunotherapy is not the catching — it is the reading. An immune reaction to treatment can begin with fever, rash, loose motions, vomiting or breathlessness, which is precisely the symptom list of a seasonal illness. Assuming "viral, it will pass" is the one mistake that turns a manageable side effect into an admission. Dengue transmission across India climbs during and just after the monsoon, so in Hyderabad and across Telangana there is a window each year where a fever genuinely could be either thing. That is the window this page is written for.
General guidance only, consistent with NCCN and ASCO patient-safety advice on immune-related side effects. Your treating oncologist’s instructions for your own case always come first.
Side by side
How do I tell dengue or viral fever apart from an immune reaction?
General patterns only, consistent with NCCN and ASCO guidance on immune-related side effects and World Health Organization dengue guidance, indicative as of August 2026. Use this to describe what you are seeing — not to decide at home which one it is.
| What you notice | Points more towards a seasonal infection | Points more towards an immune reaction to treatment |
|---|---|---|
| Typically starts | Abruptly, within days of an exposure or a mosquito bite, usually in the monsoon months | Any time from a few weeks after the first infusion to months after the last one, with no seasonal pattern |
| Fever pattern | High from day one, with severe body ache, joint pain and pain behind the eyes | Often low-grade or absent; one organ’s symptoms usually dominate instead |
| Anyone else ill at home | Common — a neighbour, a child or a colleague is often down with the same thing | Nobody else is unwell |
| Rash | Appears around day three to five, often as the fever falls, and fades in a few days | Builds gradually over weeks, often itchy, and spreads rather than fades |
| Loose motions | Sudden, often with vomiting, and usually settling within a few days | Increases over days or weeks and does not settle — never managed at home on immunotherapy |
| Breathlessness | Comes with a blocked nose, sore throat and a wet cough | New breathlessness or a dry cough with no cold at all — treated as an emergency |
| Blood tests | Falling platelets with a rising haematocrit; dengue-specific tests may turn positive | Thyroid, liver, kidney or hormone results turn abnormal while infection tests stay negative |
| What settles it | Time, fluids and monitoring under medical supervision | A decision made by your oncology team, often steroid medicine — never started at home |
Two honest caveats. In the first 48 hours these columns overlap badly, and a seasonal infection and an immune reaction can happen at the same time in the same person. That is why the standard approach is to look for infection and consider an immune cause together, on the same day, rather than choosing between them.
Did you know?
The mosquito that spreads dengue breeds in clean, stored water — coolers, overhead tanks, drums, buckets, plant trays and discarded tyres — not in dirty drains, and it bites mostly in daylight hours. That is why the single most effective monsoon precaution for a family is emptying and scrubbing every water container once a week, rather than avoiding crowds.
Precautions
What monsoon precautions actually reduce the risk?
Mosquito control at home does most of the work, and food and water hygiene does the rest. These are the things worth spending effort on. Staying away from people is not on the list for someone on immunotherapy alone.
- Empty and scrub stored water weekly — coolers, drums, buckets, plant trays, fridge trays, terrace junk and old tyres. Scrubbing matters; eggs stick to the sides.
- Cover up in daylight, not just at night — full sleeves, repellent on exposed skin, and mesh on the windows of the room the patient rests in.
- Drink boiled or properly filtered water — monsoon is also typhoid and jaundice season, and both are avoidable at the tap.
- Eat freshly cooked, hot food — skip cut fruit, salads, roadside chaat and street juices for these months. Reheat leftovers properly or throw them out.
- Keep feet dry and cover any wound — waterlogged streets carry their own infections, and a cut that is not healing should be shown to your team.
- Keep a working thermometer and write readings down — time, temperature, and anything else noticed. A caretaker with a written record makes the first phone call far more useful.
- Ask anyone at home with fever or cough to keep their distance — and tell the oncology team that somebody in the house is ill, especially if a steroid course is running.
If your own oncology team has given you tighter instructions than these, follow theirs over any general advice on this page.
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Do Not Wait Out a Monsoon Fever on Immunotherapy
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The process
What happens if a fever starts during monsoon?
The same day, not the next morning. Here is the sequence a family should expect, so nobody loses hours deciding whether the call is worth making. It always is.
- Call the helpline first, before any medicine — give the temperature, when it started, and whether there is rash, vomiting, loose motions, breathlessness or bleeding. A written record from home makes this call much faster.
- Do not buy fever or body-ache tablets at the chemist — the anti-inflammatory group of painkillers sold for body ache raises bleeding risk when dengue is possible, which is why World Health Organization dengue guidance advises avoiding that group until dengue is excluded. Your team will tell you what is safe for you.
- Expect blood tests the same day — typically a full blood count with platelets, and in season the dengue-specific tests. Liver, kidney, thyroid and other tests are added depending on the symptoms.
- Expect both possibilities to be worked up together — infection is looked for and treated, and an immune cause is considered at the same time. NCCN and ASCO guidance is built around exactly this overlap.
- Expect the cycle to be postponed if you are acutely unwell — holding a dose during an active infection is a routine safety decision. It does not mean treatment has stopped working, and it does not mean you have lost your slot.
- If dengue is confirmed, care is supportive and monitored — fluids, rest and repeated platelet checks, with the warning signs tracked. Whether that happens at home with review, in day care or as an admission is a clinical decision made on the numbers.
- Never start steroid medicine at home — not for fever, not for a rash, not for loose motions. Steroids given at the wrong moment can make an untreated infection considerably worse.
Immunotherapy at CION is given as day care, so a rescheduled cycle usually costs part of a day rather than a hospital stay. Where a response-assessment PET-CT is needed, it is coordinated at partner imaging centres.
Vaccination
Should I get vaccinated before the monsoon?
Ask your oncology team before any vaccine, and ask early rather than on the day. Timing is the part that needs planning, not the decision itself.
Inactivated vaccines — the seasonal influenza vaccine and the injectable typhoid vaccine are the two that come up most before monsoon — are generally considered acceptable during immunotherapy. The timing around your infusion dates is best planned with your team rather than settled at a pharmacy counter.
Live vaccines are a different matter and the caution here is firm: they are generally avoided during immunotherapy, and avoided while you are taking steroid medicine. A live vaccine works by giving you a controlled, weakened infection, and that is not something to hand an immune system currently being driven by treatment or suppressed by steroids. The live category includes measles-mumps-rubella, chickenpox, oral polio, BCG, yellow fever and some oral typhoid formulations. If a trip or a workplace requirement calls for one, raise it well before you commit to dates.
Dengue vaccination is not part of routine adult immunisation in India, and it is not a monsoon precaution to go looking for on your own. The protection that works for your household this season is the water container you empty on Sunday. Household members keeping their own vaccinations current adds a genuine layer of protection around the patient — though a few live vaccines in a family member need a conversation with your team first.
Vaccine availability and schedules in India are set by CDSCO approvals and national immunisation policy, and they change. Confirm current advice with your treating team.
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Common questions
Monsoon, Dengue and Fever on Immunotherapy: Common Questions
Is my risk of dengue or viral fever higher during immunotherapy?
Usually no. Immunotherapy works by activating your immune system rather than suppressing it, so on immunotherapy alone your chance of catching dengue, flu or a monsoon stomach infection is broadly the same as anyone else in your household. The exceptions are real and common enough to check: risk does rise if you are taking steroid medicine for an immune reaction, if you are receiving chemotherapy alongside immunotherapy, if your blood counts are low for another reason, or if diabetes or another long-term illness is poorly controlled. What does change for everyone on immunotherapy is how a fever is read, because an immune reaction can look identical in the first two days.
How do I know if it is dengue or an immune reaction to treatment?
You cannot reliably tell at home, and you are not expected to. Some patterns point one way: a seasonal infection often starts abruptly with high fever, severe body and joint aches, and someone else at home ill at the same time. An immune reaction more often builds over days or weeks, dominates in one organ such as the gut, lungs, skin or thyroid, and arrives with nobody else unwell. The two overlap badly in the first 48 hours and can happen together. Blood tests the same day settle it. Describe what you are seeing to your oncology team and let the tests decide.
What monsoon precautions should we take at home?
Mosquito control at home does most of the work. Aedes mosquitoes, which spread dengue, breed in clean stored water and bite during the day, so empty and scrub coolers, plant trays, drums, buckets and terrace junk once a week, and use mesh, full sleeves and repellent in daylight hours. Drink boiled or filtered water and eat freshly cooked hot food, since monsoon is also typhoid and jaundice season. Keep a working thermometer and write the readings down with times. Ask anyone at home with fever or cough to keep their distance, and tell the oncology team if someone in the house is ill.
Will my immunotherapy be stopped if I get dengue?
A cycle may be postponed while you are acutely unwell, and that is routine rather than a setback. Holding a dose during an active infection is a normal safety decision, not a sign that treatment has stopped working or that you have lost your place. Your oncology team decides when it is safe to restart, usually once the fever has settled, the blood counts have recovered and you are eating and drinking normally again. Ask for the plan in writing at the time, including the date you should come back for review, so the family is not left guessing when the next infusion is due.
Can I take fever or body-ache tablets bought at the chemist?
Do not buy fever or body-ache medicine over the counter during monsoon without speaking to your oncology team first. The anti-inflammatory group of painkillers commonly sold for body ache increases bleeding risk when dengue is a possibility, which is why World Health Organization dengue guidance advises avoiding that group until dengue has been ruled out. Fever medicine can also mask a temperature your team needs to see. Call first, describe the fever and any rash, vomiting or loose motions, and let your team tell you what is safe for you and at what dose. Never start steroid medicine at home for anything.
Should I get a flu or dengue vaccine before the monsoon?
Ask your oncology team before any vaccine, and ask early. Inactivated vaccines, such as the seasonal influenza vaccine and the injectable typhoid vaccine, are generally considered acceptable during immunotherapy, though the timing is planned with your team rather than decided at a pharmacy counter. Live vaccines are different and are generally avoided during immunotherapy and while you are taking steroid medicine. Dengue vaccination is not part of routine adult immunisation in India and is not a monsoon precaution to arrange on your own; mosquito control at home is the protection that works. Household members keeping their own vaccinations current adds a layer of protection around you.