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First Step Towards Universal Pneumococcal Vaccine ZPY-CpG-Ch: 80-100% Survival in Mice

Target:UPSC GS-IIIMPSCTeachingSSC GAPrelims HighMains HighStatic GK Link
03 Sept 2026
~2 min
Source: The Hindu
Key Data:80-100% survivalSerotypes tested: 1, 11A, 33F, 8100% survival against 11A and 33F50% survival against serotype 8PCV1320,000 isolates
Bodies:BITS-PilaniICGEB
Practice MCQs from today's news ▸
What This Article Covers

1.Universal pneumococcal vaccine developed using reverse vaccinology to target all 100+ serotypes of Streptococcus pneumoniae.

2.The ZPY-CpG-Ch vaccine elicited protective antibodies in mice, comparable to PCV13, with 80-100% survival against serotype 1 and 100% against serotypes 11A and 33F.

3.Limitation: vaccinated mice still harbored bacteria in the upper respiratory tract, indicating potential for continued transmission.

The Big Picture
Prelims · HighMains · High

Scientists take a first step towards a universal pneumococcal vaccine using reverse vaccinology. The experimental vaccine ZPY-CpG-Ch showed 80-100% survival in mice against lethal S. pneumoniae serotypes, addressing serotype replacement and antibiotic resistance issues in current vaccines. However, it did not reduce upper respiratory carriage, meaning vaccinated mice can still spread infection.

Exam Lens

Quick Exam Facts From News

Vaccine FormulationZPY-CpG-Ch (proteins Z, P, Y + CpG + chitosan)
Reverse VaccinologyGenome-based approach using 20,000 S. pneumoniae isolates, 1,300 common genes
Survival Rate (Serotype 1)80-100%
Non-vaccine Serotype Protection11A, 33F: 100% | Serotype 8: 50%

1-Minute Revision

  • ›Vaccine Formulation: ZPY-CpG-Ch (proteins Z, P, Y + CpG + chitosan)
  • ›Reverse Vaccinology: Genome-based approach using 20,000 S. pneumoniae isolates, 1,300 common genes
  • ›Target this Data: 80-100% survival against serotype 1 in mice
  • ›Target this Concept: Reverse vaccinology (genome-based vaccine design)
  • ›Target this Limitation: No reduction in upper respiratory carriage

Mastered this topic? Test your knowledge with a full MCQ quiz.

Practice exam-style questions, track your score, and strengthen your recall.

Q1Static LinkageEasy

Which approach was used to develop the universal pneumococcal vaccine ZPY-CpG-Ch?

Q2Statement-basedHard

Consider the following statements regarding the ZPY-CpG-Ch vaccine:

1. The vaccine consists of three surface proteins Z, P, and Y, along with CpG and chitosan.

2. The vaccine completely prevented the carriage of S. pneumoniae in the upper respiratory tract of vaccinated mice.

3. The vaccine offered 50% protection against serotype 8.

Which of the statements given above is/are correct?

Q3Data-centricMedium

What was the survival rate of mice vaccinated with ZPY-CpG-Ch when exposed to a lethal dose of S. pneumoniae serotype 1?

Q4Application/ImpactMedium

What is the primary advantage of a universal pneumococcal vaccine over current PCVs, as discussed in the article?

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