Relevance: GS II (Health) & GS III (Science) | Source: The hindu
1. What is the Big News?
India’s drug authority (DCGI) has finally approved a new dengue vaccine called Qdenga (or TAK-003).
- Who made it? A Japanese company named Takeda.
- Who can take it? Anyone between the ages of 4 to 60 years.
2. The Science: Why is Dengue so dangerous?
To understand the vaccine, you must know how the dengue virus behaves:
- The 4 Brothers (Strains): Dengue is not just one virus; it has four different types or “strains” (DENV-1, 2, 3, and 4).
- The Second Attack: If a mosquito gives you Strain 1, your body learns to fight it. But if a mosquito later bites you with Strain 2, your body gets confused. This makes the second infection much more severe and life-threatening.
- The Solution (Tetravalent): Because of this, a simple vaccine won’t work. We need a Tetravalent vaccine—a “4-in-1” shot that protects against all four strains at the same time.
3. The Reality Check: Pros and Cons of Qdenga
| The Good News (Pros) | The Bad News (Cons) |
| No Blood Tests Needed: Older vaccines required you to prove you already had dengue once before taking the shot. Qdenga can be given to anyone safely without prior tests. | Weak Against Some Strains: It is very strong against Strains 1 & 2, but unfortunately weak against Strains 3 & 4 (which are currently spreading fast in India). |
| Saves Lives: It is very good at stopping severe illness. It keeps patients out of the ICU, saving hospital beds during monsoon outbreaks. | Mosquitoes Still Matter: The vaccine reduces your illness, but it does not stop the virus from spreading. We still need to clear stagnant water and kill mosquitoes. |
4. India’s Own Mission: ‘DengiAll’
India is not just waiting for foreign vaccines. We are building our own!
- Our indigenous vaccine candidate is called ‘DengiAll’.
- It is being developed jointly by ICMR (Indian Council of Medical Research) and a private company, Panacea Biotec, and is currently in final human trials.
“UPSC Trap”
- The “Complete Cure” Trap: UPSC will try to trick you by saying, “The new Qdenga vaccine completely stops the transmission of the dengue virus from person to person.” Incorrect. It only reduces the severity of the disease in your body; it is not a complete transmission blocker.
- The “Single Virus” Trap: A statement might say dengue is caused by a single, rapidly mutating virus. Incorrect. It is caused by four distinct strains (serotypes).
UPSC Value Box
| Key Term | Simple Meaning |
| Tetravalent Vaccine | A single vaccine dose that is designed to fight off four different strains of a virus at the same time. |
| DCGI | Drugs Controller General of India. The supreme government authority that gives the final permission to sell any new medicine or vaccine in India. |
With reference to the dengue virus and its vaccine development, consider the following statements:
- Dengue is caused by four distinct viral serotypes, and a subsequent infection by a different serotype often leads to more severe disease.
- The newly approved TAK-003 (Qdenga) vaccine completely blocks the transmission of the virus, eliminating the need for mosquito vector control.
- ‘DengiAll’ is an indigenous tetravalent dengue vaccine candidate being developed in collaboration with the Indian Council of Medical Research (ICMR).
Which of the statements given above is/are correct?
(a) 1 and 2 only
(b) 1 and 3 only
(c) 3 only
(d) 1, 2 and 3
Correct Answer: (b)
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