Final answer:
Ceftriaxone is typically the antibiotic of choice for treating gram-negative bacilli in the gastrointestinal tract caused by Salmonella. Antibiotic use may differ based on the infection stage and severity, with fluoroquinolones as an alternative.The right option is 2)
Step-by-step explanation:
The antibiotic of choice to treat gram-negative bacilli in the gastrointestinal (GI) tract for Salmonella is typically Ceftriaxone. This is because Ceftriaxone is effective against a wide range of gram-negative bacteria and is recommended for systemic infections like Salmonellosis, which can result from a Salmonella infection.
Treatment of Salmonella can differ depending on the stage of infection and the presence of systemic disease. During the early stage, antibiotics such as amoxicillin and doxycycline may be effective, but in the case of more severe infections or bacteremia, Ceftriaxone can be given intravenously. Additionally, fluoroquinolones, which are not listed as options in the multiple-choice question, are an alternative treatment for Salmonella infections.
It is also important to mention that not all GI infections require antibiotic therapy. In some cases, supportive care such as rehydration is sufficient.