Bacterial genome has been completely recognised for which one of the following agents –
💡 Explanation
## **Core Concept**
The question tests knowledge of the genomic characterization of bacterial agents. Complete recognition of a bacterial genome implies that its entire DNA sequence has been determined and is publicly available for research and clinical purposes. This is a significant milestone in understanding the genetics, pathogenicity, and potential vulnerabilities of the bacterium.
## **Why the Correct Answer is Right**
The correct answer, **.**, corresponds to *Haemophilus influenzae*. In 1995, *Haemophilus influenzae* was the first free-living bacterium to have its genome completely sequenced. This achievement was a landmark in the field of genomics and paved the way for the sequencing of other bacterial genomes. The sequencing of *H. influenzae* provided valuable insights into its pathogenic mechanisms, potential drug targets, and vaccine development.
## **Why Each Wrong Option is Incorrect**
- **Option A:** *Escherichia coli* has had its genome sequenced, but it was not the first. Its genome was completed in 1997, two years after *H. influenzae*.
- **Option B:** While several *Streptococcus* species have been sequenced, *S. pneumoniae* was one of them, but not the first to have its genome completely recognized.
- **Option D:** *Mycobacterium tuberculosis* genome was completed in 1998, also after *H. influenzae*.
## **Clinical Pearl / High-Yield Fact**
A memorable point from this question is that *Haemophilus influenzae* type b (Hib) vaccine development was significantly aided by genomic studies, showcasing the practical application of genomic knowledge in preventing bacterial infections.