Final answer:
The likely diagnosis for the two-year-old female with foul smelling, blood-tinged mucoid drainage from the nostril is bacterial rhinosinusitis, which is treated with appropriate antibiotics.
Step-by-step explanation:
The two-year-old female's three-day history of foul smelling, blood-tinged, mucoid drainage from the left nostril could most likely be diagnosed as bacterial rhinosinusitis. This condition is an infection and inflammation within the paranasal sinuses, frequently occurring after a viral infection that compromises the immune defenses, allowing opportunistic bacteria to establish themselves. The most common pathogens associated with bacterial rhinosinusitis are Streptococcus pneumoniae,
Haemophilus influenzae, and Moraxella catarrhalis. Children presenting with these symptoms are often treated with antibiotics tailored to the suspect bacterial agents based on local resistance patterns and the severity of the infection. It is important for a healthcare professional to evaluate the child and possibly culture the nasal discharge to identify the exact pathogen and select the most effective antibiotic.