An antibiotic is not useful against a virus whereas a vaccine is. Which one of the following is the most appropriate reason for this ?

Antibiotics are specifically designed to target unique bacterial structures and biochemical pathways, such as cell wall synthesis, ribosomes, or specific metabolic processes [5]. Viruses lack these bacterial structures and metabolic pathways, instead utilizing the host cell's machinery to replicate, which makes them unaffected by antibiotic mechanisms [5]. In contrast, vaccines function by introducing a harmless part of a pathogen (antigen) to the body [4]. This process trains the immune system to recognize and fight the specific virus or bacteria by stimulating adaptive immune responses, including the production of antibodies and T-cells. Therefore, while antibiotics fail to find a target in viruses, vaccines effectively prepare the body's natural defenses to neutralize viral threats [4].

Sources

1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 3: Health: The Ultimate Treasure > 3.5.1 Treatment of diseases > p. 39
2. [5] https://www.cdc.gov/vaccines/basics/explaining-how-vaccines-work.html
3. [3] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 3: Health: The Ultimate Treasure > Snapshots > p. 42
4. [4] https://www.nature.com/articles/s41577-021-00578-z