Final answer:
Tuberculosis is a bacterial infection that is decreasing due to effective drug treatment, although antibiotic resistance remains a broader issue for many bacterial infections.
Step-by-step explanation:
The bacterial infection that is definitely decreasing because of effective drug treatment is tuberculosis. Health officials worldwide are concerned about antibiotic resistance, but in the case of tuberculosis, antibiotics can relieve symptoms relatively quickly, though complete infection eradication takes longer. Patients with nonresistant strains of tuberculosis who discontinue treatment once symptoms are relieved increase the risk of recurrent infection as the bacteria are not wholly eradicated and may become resistant. Usage of narrow-spectrum antimicrobial drugs would not be suitable for tuberculosis treatment as it is usually caused by a single, identifiable pathogen and requires a specific treatment regime, often including a combination of drugs to prevent resistance.
Antibiotic resistance is a growing concern, with some bacteria, including those responsible for tuberculosis and pneumonia, developing resistance to previously effective antibiotics. This is a serious problem that undermines the treatment of various infections.
The decrease in tuberculosis cases indicates that appropriate and complete use of antibiotics can have a positive impact on controlling bacterial infections, underscoring the importance of following prescribed treatment plans in order to combat antibiotic resistance.