Proteus mirabilis and its role in dacryocystitis

Area of Science:

• Ophthalmology
• Infectious Diseases
• Microbiology

Background:

• Dacryocystitis, an inflammation of the lacrimal sac, is typically caused by common bacteria like Staphylococcus aureus.
• Uncommon pathogens, such as Proteus mirabilis, can also lead to dacryocystitis, especially in specific patient populations.

Observation:

• A case study involving an 84-year-old male with recurrent dacryocystitis unresponsive to empiric antibiotics.
• Ocular discharge culture identified Proteus mirabilis as the causative agent.
• Initial treatment with oral antibiotics showed partial success, but a dacryocystorhinostomy (DCR) was ultimately required.

Findings:

• Proteus mirabilis, a gram-negative bacillus, can cause ocular infections including dacryocystitis.
• Culture and susceptibility testing are crucial for identifying uncommon pathogens and guiding treatment in non-responsive dacryocystitis cases.
• While standard oral antibiotics can treat Proteus-induced dacryocystitis, surgical intervention like DCR may be necessary for long-term resolution and prevention of recurrence.

Implications:

• Highlights the importance of considering uncommon bacterial pathogens in refractory dacryocystitis.
• Emphasizes the role of microbiological cultures in guiding appropriate antibiotic therapy.
• Underscores that surgical management, such as DCR, may be essential for managing chronic or recurrent cases of dacryocystitis to restore nasolacrimal patency.