According to WHO about half of the world's population is at risk of dengue, with an estimated 100-400 million infections occurring each year.
Aedes aegypti mosquito. (Creative Commons)
Amidst the torrential monsoon rains, southern states like Telangana and Karnataka are battling a surge in dengue cases, with over a thousand infections already reported.
As rainwater pools in urban nooks and crannies, it’s not just flooding streets but also bringing the dreaded dengue virus to doorsteps.
While the mosquito-borne viral infection usually causes flu-like illness, occasionally it also develops into a potentially lethal complication called severe dengue or dengue hemorrhagic fever.
Amid the surge in cases, South First brings you a know-it-all guide to navigate through the illness.
A viral infection transmitted to humans through the bite of infected Aedes mosquitoes, dengue is found in tropical and sub-tropical climates, mostly in urban and semi-urban areas.
According to World Health Organisation about half of the world’s population is at risk of dengue, with an estimated 100-400 million (10-40 crore) infections occurring yearly.
Most dengue infections are asymptomatic or produce only mild illness, but the virus can occasionally cause more severe, life-threatening cases. It is caused by the dengue virus (DENV), which has four distinct serotypes (DENV-1, DENV-2, DENV-3, and DENV-4).
While the infection is caused primarily by mosquito bites, it can be transmitted through various ways.
1. Ideal conditions for microorganisms
High moisture content in the air during the monsoon season creates an environment where harmful microorganisms thrive, increasing the transmission of diseases through mosquitoes, water, air, and contaminated food.
2. Mosquito breeding habits
3. Extended lifespan and increased activity
4. Indoor risks
During the monsoon season, people often spend more time indoors, mistakenly believing they are safe from mosquito bites. However, mosquitoes can breed unnoticed in domestic containers, increasing the risk of indoor bites.
5. Waste management issues
Heavy rains can disrupt proper waste management, leading to more containers and debris that collect water, becoming mosquito breeding sites.
By understanding these factors, individuals and communities can take preventive measures to reduce the risk of mosquito-borne diseases during the breeding season.
Dengue symptoms can vary from mild to severe. Here are the main symptoms to look out for:
Mild Dengue Fever
Severe dengue (dengue hemorrhagic fever/dengue shock syndrome)
Severe dengue is more serious and can be life-threatening. Symptoms of severe dengue usually develop after the initial mild symptoms. Watch for these warning signs:
Differentiating between dengue and other viral fevers can be challenging because many viral infections share similar symptoms, such as fever, headache, and muscle pain.
However, certain characteristics can help distinguish dengue from other viral fevers. Here are some key differences:
Also caused by mosquito bites, here are the prominent symptoms of Chickungunya:
While symptoms can provide clues, diagnostic tests are essential to confirm the specific cause of the fever:
It’s important to get tested for dengue if you show symptoms suggesting you might be infected, especially if you live in or have recently travelled to an area where dengue is common.
Here’s when to consider getting a dengue test:
Early symptoms (1-3 days): If you experience a sudden onset of high fever (up to 104°F or 40°C), severe headache (especially behind the eyes), joint and muscle pain, rash, nausea, vomiting, or mild bleeding (like nosebleeds or gum bleeding), it’s important to seek medical advice.
Persistent symptoms (4-10 days): If your symptoms persist or worsen, such as continuous high fever, increasing pain, or the appearance of new symptoms like severe abdominal pain, persistent vomiting, severe bleeding, or difficulty breathing, you should get tested immediately.
High-risk areas: If you live in or have travelled to regions with high rates of dengue transmission, it’s prudent to get tested if you develop any symptoms associated with dengue.
Exposure to dengue: If someone in your household or community has been diagnosed with dengue and you start showing symptoms, it’s important to get tested.
Hospitalisation for dengue is needed in cases where the infection becomes severe or if there are warning signs of severe dengue.
Here are the situations that warrant hospitalisation:
Hospitalisation is essential if a person develops severe dengue, which includes complications such as severe bleeding, organ impairment, or plasma leakage.
The key warning signs include low platelet count along with the severe dengue symptoms listed above in the article.
Normal platelet counts range from 1,50,000 to 4,50,000 platelets per microliter of blood. In dengue, a significant drop in platelet count can occur, and monitoring these levels is crucial.
Certain individuals may need hospitalisation even with moderate symptoms, including:
Platelets, also known as thrombocytes, are small blood cells that play a crucial role in blood clotting and preventing bleeding.
With dengue, the virus can cause a significant drop in platelet count, leading to an increased risk of bleeding and other complications.
How platelets fall in dengue
Monitoring platelets
Mild thrombocytopenia (1,00,000 – 1,50,000 platelets/microliter)
Symptoms: Usually mild or no symptoms.
Action: Regular monitoring and hydration. Usually managed at home with advice from a healthcare provider.
Moderate thrombocytopenia (50,000 – 1,00,000 platelets/microliter)
Symptoms: Increased risk of bruising and mild bleeding.
Action: Close monitoring by a healthcare provider. Seek medical advice if symptoms worsen.
Severe thrombocytopenia (below 50,000 platelets/microliter)
Symptoms: Higher risk of significant bleeding, such as nosebleeds, gum bleeding, or blood in the urine/stools.
Action: Hospitalisation may be required for close monitoring and supportive care.
Critical thrombocytopenia (below 20,000 platelets/microliter)
Symptoms: High risk of severe bleeding, internal bleeding, and hemorrhagic complications.
Action: Immediate hospitalisation is essential. Intensive monitoring and possibly platelet transfusions are necessary.
The use of alternative treatments such as papaya leaf extract and goat milk for managing dengue has been popular in India. However, the effectiveness and safety of these treatments are still subjects of debate and ongoing research.
Here’s what we know about these alternative treatments:
Claimed Benefits
Increase in platelet count: Some studies and anecdotal reports suggest that papaya leaf extract can help increase platelet count in dengue patients.
Antioxidant properties: Papaya leaves contain antioxidants, which may help reduce oxidative stress and inflammation.
Scientific evidence
Limited studies: A few small studies and clinical trials have shown positive results regarding the ability of papaya leaf extract to increase platelet count in dengue patients. For example, some studies have reported a significant increase in platelet counts and a reduction in hospital stay duration.
“But are these studies done in a very controlled manner?” questioned Dr Philips, popularly known by his handle TheLiverDoc on Twitter.
He added, “A decrease in platelet count may be attributed to infections such as dengue fever or malaria, as well as chronic liver diseases that endure over-extended periods. Additionally, immune-mediated thrombocytopenia can occur, wherein the immune cells target and destroy platelets, leading to a decline in platelet counts. As a result, the potential causes for low platelet count are diverse and varied.”
“There is no evidence that papaya leaf extract improves survival in dengue fever cases. The drop in platelet count is almost invariably reversible, temporary, and without complications,” Dr Rajeev Jayadevan, convener, scientific committee and past president of the Indian Medical Association (Kochi Chapter) explained in past to South First.
Claimed benefits
Nutritional support: Goat milk is rich in nutrients, including proteins, vitamins, and minerals, which can support general health and recovery.
Digestibility: It is easier to digest compared to cow’s milk and might be better tolerated by some people.
Lack of specific evidence: There is no substantial scientific evidence that specifically supports the use of goat milk to treat or manage dengue symptoms or increase platelet count.
The symptoms of dengue fever can differ somewhat between children/adolescents and adults:
Fever and rash
Pain and discomfort
Gastrointestinal symptoms
Severe dengue
Other differences
Prevention of dengue should focus on reducing mosquito exposure and managing symptoms.
Here’s a comprehensive overview:
Mosquito control
Community measures
Travel precautions
If travelling to areas with known dengue outbreaks, take extra precautions such as using mosquito nets, wearing protective clothing, and using repellents.
Medical care
Monitoring
Research and development
Vaccines: Several dengue vaccines are under development and some are approved in certain countries. Vaccination can play a crucial role in preventing dengue infections.
(Edited by Sumavarsha Kandula)
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