Written By: Mrs. Mayuri Mathur

Published On: 08 Jun, 2023 6:33 PM | Updated On: 11 May, 2024 4:17 PM

Prevention and Control of Dengue Fever: Vaccines and Other Measures

Dengue fever, caused by the dengue virus transmitted through the bite of infected Aedes mosquitoes, is a significant global health concern. Dengue viruses are primarily transmitted through the bite of infected Aedes mosquitoes, specifically Ae. aegypti and Ae. albopictus species. These mosquitoes are responsible for the spread of these diseases.

Dengue is prevalent in tropical and sub-tropical regions across the globe, particularly in urban and semi-urban areas. The disease thrives in these climates, posing a significant challenge for effective control and prevention.

However, several strategies, including the development of vaccines and the implementation of other preventive measures, offer hope in the fight against this debilitating disease.

Vaccines for Dengue Fever

Developing effective vaccines against dengue fever has been a primary focus of research and development efforts. Currently, several dengue vaccines are available, with one licensed vaccine, Dengvaxia, approved for use in some countries. Dengvaxia protects against all four dengue virus serotypes, offering a significant advancement in dengue prevention.

The vaccine is administered through a series of doses, usually given to individuals between the ages of 9 and 45. However, the efficacy of Dengvaxia has shown variations across different populations and age groups. Additionally, the vaccine was approved for administration among people living in areas where dengue is common, including Puerto Rico, American Samoa, Guam, and the U.S. Virgin Islands.

Although it has demonstrated greater effectiveness in individuals with prior dengue infection, in individuals without previous exposure, it may pose a risk of more severe disease if they are subsequently infected. Therefore, careful evaluation of vaccine candidates and implementation strategies is necessary to ensure their safety and effectiveness.

Ongoing research continues to explore new vaccine candidates and strategies to improve dengue vaccine efficacy. Efforts are focused on developing tetravalent vaccines that provide robust and balanced protection against all four dengue virus serotypes. 

Additionally, advancements in vaccine technology, such as live-attenuated, subunit, and viral-vectored vaccines, hold promise for future vaccine development.

Other Measures for Dengue Prevention and Control

While Dengvaxia is a significant breakthrough in preventing dengue, it is crucial to recognize that it is just one part of a comprehensive strategy to combat the disease only for certain populations. Furthermore, it is essential to understand that the vaccine alone cannot provide complete protection against dengue.

Hence, people who are not eligible for the vaccine can lower their risk by taking steps to avoid mosquito bites. But, did you know that, Ae? aegypti and Ae. albopictus mosquitoes, responsible for spreading dengue, exhibit a unique feeding behavior. They are active both during the day and at night. 

This implies that individuals should remain vigilant and take precautions to safeguard themselves from mosquito bites throughout the day, regardless of the time.

So, to effectively reduce the risk of dengue, it is essential to adopt appropriate preventive measures, such as 

1. Vector Control:

Reducing mosquito populations through integrated vector management is a fundamental approach to dengue prevention. This involves eliminating standing water where mosquitoes breed, such as removing stagnant water containers, covering water storage containers, and ensuring proper waste management practices. Community engagement and public awareness campaigns play a crucial role in promoting these measures.

2. Personal Protection:

Individuals living in dengue-endemic areas should adopt personal protective measures to minimize mosquito bites. This includes using mosquito repellents containing DEET or other recommended ingredients, wearing protective clothing such as long sleeves and pants, and using insecticide bed nets. These measures are particularly important during peak mosquito activity times, such as early morning and late afternoon.

3. Community Engagement:

Engaging communities in dengue prevention efforts is vital for sustainable control. Community-based initiatives can include organizing clean-up campaigns, promoting environmental hygiene, and educating residents about dengue prevention measures. Active involvement of schools, local authorities, and community leaders can foster a sense of ownership and empower communities to take proactive steps.

4. Early Diagnosis and Case Management:

Early detection and timely management of dengue cases are crucial for preventing severe complications. Strengthening healthcare systems, training healthcare providers, and raising awareness among the public about dengue symptoms and the importance of seeking medical care are vital components of comprehensive dengue control.

5. Surveillance and Outbreak Response:

Effective surveillance systems enable the early detection of dengue outbreaks and facilitate prompt response measures. Monitoring mosquito populations, tracking dengue cases, and implementing targeted interventions in high-risk areas can help mitigate the spread of the disease. Timely reporting, data sharing, and coordination between public health agencies are essential for effective outbreak response.

Conclusion:

Prevention and control of dengue fever require a multi-faceted approach encompassing vaccination, vector control, personal protection, community engagement, early diagnosis, and outbreak response. While the development of effective dengue vaccines is a significant milestone, it should be complemented with sustained efforts to implement other preventive measures.

By combining vaccines and comprehensive preventive measures, we can strive towards a future with reduced dengue-related morbidity and mortality. Stay informed, stay vigilant, and prioritize your health by taking necessary precautions against mosquito-borne diseases.