Blog & News Dengue Fever: Why Cases Spike During the Rainy Season
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Dengue Fever: Why Cases Spike During the Rainy Season

4 min read . 22 Jul 2025
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Health & Wellness

Dengue fever is a major health concern in Indonesia, with thousands of cases reported every year. The disease is spread by Aedes aegypti mosquitoes, which thrive during the rainy season.


Increased rainfall, flooding, and humidity create perfect conditions for mosquitoes to breed, leading to outbreaks across the country.


How Weather Affects Dengue Spread


Heavy rains, often influenced by climate patterns like El Niño and La Niña, leave behind standing water in containers, drains, and puddles. These become breeding sites for mosquitoes.


Urban areas with poor drainage are especially at risk, as clogged gutters and flooded streets allow mosquito populations to grow rapidly.


Why Mosquitoes Multiply Faster in the Rainy Season


Warm, wet weather speeds up the mosquito life cycle. In just a week, eggs can hatch into adult mosquitoes.


The dengue virus also develops faster inside mosquitoes during this time, making it easier for them to spread the disease to humans. Common household items like flower pots, buckets, and uncovered water storage can become breeding grounds if not properly managed.


The Impact of Dengue Outbreaks


During peak dengue season, hospitals see a sharp rise in patients suffering from high fever, severe joint pain, and fatigue. Children are especially vulnerable, and delays in treatment can lead to dangerous complications.


Severe Dengue (DHF & DSS)


While most people recover with proper care, some develop severe dengue (Dengue Hemorrhagic Fever or Dengue Shock Syndrome), which can cause bleeding, organ failure, and even death. Early detection and medical attention are crucial.


How to Prevent Dengue


1. Follow the 3M Strategy:


  • Drain (Menguras): Regularly clean water containers (buckets, tubs, gutters).  
  • Cover (Menutup): Keep water storage tightly sealed.  
  • Dispose (Mengubur): Get rid of unused items that collect water (bottles, old tires).  
  • Plus: Use mosquito repellent, nets, and larvicides.


2. Community Efforts


Neighborhoods can organize clean-up drives and support Jumantik (mosquito larvae monitors) to inspect homes and eliminate breeding sites.


3. Fogging (With Caution)


Fogging can kill adult mosquitoes, but doesn't stop eggs or larvae. It should be combined with other prevention methods.


When to Seek Medical Help


If you or a family member experiences:


  • Sudden high fever
  • Severe headache or muscle pain
  • Rash, nausea, or bleeding …seek medical care immediately.


Early treatment saves lives.


Frequently Asked Questions


What is dengue fever?


A viral disease spread by mosquitoes, causing high fever, severe joint pain, headache, and rash. Most recover in 1-2 weeks, but severe cases can be life-threatening.



Why is it called "breakbone fever"?


Because the muscle and joint pain can feel so intense, some say it's like bones breaking.


Is dengue caused by a virus or bacteria?


A virus that spreads only by infected Aedes mosquitoes (not person-to-person). What are the warning signs?


  • High fever (40°C/104°F)  
  • Severe pain (head, eyes, muscles)  
  • Rash, nausea, vomiting  
  • Danger signs: Bleeding, belly pain, extreme fatigue (seek help immediately).


How is it treated?


No cure, doctors manage symptoms with fluids, pain relief, and close monitoring. Never self-medicate with aspirin or ibuprofen!


How to prevent it?


  • Remove standing water (mosquito breeding sites).  
  • Use repellent, wear long sleeves, and sleep under nets.


Need help? Visit a doctor at the first sign of symptoms.


(Sources: WHO, CDC, Mayo Clinic)


Your Partner in Dengue Care


We provide:


  • Fast, accurate dengue testing  
  • Expert treatment and monitoring  
  • Prevention advice for families


Don't wait, visit us if you suspect dengue or need guidance on staying safe.


Stay Protected Year-Round


Dengue isn't just a rainy-season problem. Stay vigilant by removing stagnant water, using repellent, and keeping your surroundings clean.


Prevention is the best defense! Need help?


Contact Bali International Hospital for expert care and advice. (Sources: Indonesian Ministry of Health, WHO, UNICEF)