As India enters the monsoon season, several infectious diseases have started spreading across different states. Increased rainfall, humidity, mosquito breeding, and contaminated food and water have led to a rise in both viral and bacterial infections. While most illnesses remain localized, health authorities have issued advisories in several regions.

1. Dengue Cases Rising Before Peak Monsoon

Dengue has emerged as the biggest seasonal health concern in India. An early rise in suspected dengue cases has been reported in cities like Pune following recent rainfall, with health officials warning that cases may increase further as the monsoon progresses.

Cause: Dengue virus spread by Aedes mosquitoes.

Common Symptoms

• High fever
• Severe headache
• Muscle and joint pain
• Skin rash
• Nausea and vomiting

Prevention

• Eliminate stagnant water.
• Use mosquito repellents and nets.
• Wear full-sleeved clothing.
• Seek medical care if fever persists for more than two days.

2. Shigella Infection Spreading in Kerala

Kerala is currently witnessing one of India’s most significant bacterial outbreaks. As of late June 2026, the state has reported around 290 Shigella cases during June, with several deaths linked to the infection. Kozhikode remains among the worst-affected districts.

Symptoms

• Bloody diarrhoea
• High fever
• Severe abdominal cramps
• Vomiting
• Dehydration

The infection spreads through contaminated food, water, and poor hygiene.

3. Seasonal Viral Fever

Hospitals across several states continue to report a rise in viral fever cases, especially among children and older adults.

Symptoms include:

• Fever
• Sore throat
• Body aches
• Headache
• Fatigue

Most patients recover within a week with adequate rest, hydration, and medical advice.

4. Food Poisoning and Gastroenteritis

High temperatures and poor food storage have led to an increase in food-borne illnesses caused by bacteria such as E. coli and Salmonella. The World Health Organization continues to emphasize safe food handling, proper cooking, and clean drinking water to reduce these infections.

Symptoms

• Diarrhoea
• Vomiting
• Stomach cramps
• Fever

5. Malaria and Chikungunya

With the arrival of monsoon rains, health departments are also preparing for an increase in malaria and chikungunya cases. These mosquito-borne diseases are expected to rise over the coming weeks, particularly in urban areas with stagnant water. Preventive mosquito-control measures are being intensified in several districts.

6. COVID-19 and Other Respiratory Infections

COVID-19 continues to circulate in India at relatively low levels. Seasonal influenza and other respiratory viruses are also causing mild infections, particularly among elderly people and those with weakened immunity. Most cases remain mild, but vulnerable individuals should continue following basic hygiene precautions.

Who Is Most at Risk?

People who are more vulnerable include:

• Children under five
• Senior citizens
• Pregnant women
• People with diabetes or heart disease
• Individuals with weakened immune systems

How to Stay Safe

To reduce the risk of infection during the monsoon:

• Drink boiled or purified water.
• Wash hands regularly with soap.
• Eat freshly cooked food.
• Prevent water stagnation around your home.
• Use mosquito repellents and nets.
• Seek medical attention if you develop high fever, bloody diarrhoea, severe dehydration, or difficulty breathing.

Conclusion

During May and June 2026, dengue remains India’s most significant seasonal viral threat, while Kerala’s Shigella outbreak has become the country’s most notable bacterial health concern. Seasonal viral fevers, food poisoning, malaria, and chikungunya are also increasing with the onset of the monsoon. Following basic hygiene practices, controlling mosquito breeding, and seeking early medical treatment remain the best ways to stay protected during this high-risk season.