Which of the following is a correct reason resistant strains are concerning?

• A. Early empiric treatment may fail and treatment choices will be limited
• B. They are less virulent than susceptible strains
• C. They reduce hospitalizations
• D. They cannot transfer resistance

Answer: (A)

When clinicians treat infections, they often start empiric therapy before lab results show exactly which organism is causing the illness and what it’s susceptible to. If the infecting strain is resistant to the drugs commonly used first, the initial treatment may fail, delaying effective therapy and potentially worsening outcomes. As resistance becomes more common, the number of medicines that will reliably work against the pathogen shrinks, making it harder to choose an option that will be effective without causing extra toxicity or complications. That combination of potential treatment failure and fewer available effective drugs is why resistant strains are a major public health concern.

It’s also worth noting why the other ideas aren’t as sound. Resistance doesn’t inherently mean a pathogen is less virulent; virulence varies and resistant strains can be just as capable of causing severe disease. Resistant infections don’t typically reduce hospitalizations; they often lead to longer stays and higher costs. And resistance can be spread to other bacteria through gene transfer, so the concern isn’t that resistance cannot be transferred—it’s quite the opposite.