Select a Community
Are you sure you want to trigger topic in your Anconeus AI algorithm?
You are done for today with this topic.
Would you like to start learning session with this topic items scheduled for future?
Coagulase-negative, gram-positive cocci
29%
2/7
Facultative anaerobic gram-positive bacilli
14%
1/7
Gram-negative diplococci
Oxidase-positive, non-lactose fermenting, gram-negative bacilli
Weakly acid-fast, gram-positive branching filamentous bacilli
Select Answer to see Preferred Response
This patient developed a corneal abrasion secondary to a foreign body. The most common pathogen seen in the culture of a corneal foreign body is coagulase-negative, gram-positive cocci (staphylococci).A corneal abrasion occurs when there is disruption of the corneal epithelium secondary to mechanical trauma to the eye (a foreign body). Patients typically present with severe eye pain, photophobia, and foreign body sensation in the eye. Patients may have reactive miosis in the affected eye and difficulty opening the eye due to pain. Fluorescein dye will highlight the corneal defect. Cultures are rarely obtained from the corneal foreign body; however, the most common pathogen grown is coagulase-negative staphylococci. Other common organisms include streptococci, Pseudomonas aeruginosa, and Haemophilus species. The treatment of choice is irrigation of the eye and empiric topical antibiotics (erythromycin ointment or trimethoprim-polymyxin B).Gupta et al. studied ocular injuries caused by foreign bodies. The authors found that since most foreign bodies are metal and enter the eye at high speed, most (roughly 2/3) become lodged in the posterior segment. The authors recommend that recent advancements in surgical techniques should be implemented to limit morbidity in patients with ocular foreign bodies.Incorrect Answers: Answer 2: Facultative anaerobic gram-positive bacilli can be seen in Listeria monocytogenes infection, which can result in septicemia, spontaneous abortion in pregnancy, and meningitis in patients who are immunocompromised.Answer 3: Gram-negative diplococci describe Neisseria gonorrhoeae infection. This pathogen can result in bacterial keratitis. Infection is spread through sexual contact or a fetus passing through the birth canal.Answer 4: Oxidase-positive, non-lactose fermenting, gram-negative bacilli describe a Pseudomonas aeruginosa infection. Pseudomonas infection of the eye is most likely to appear in patients who use contact lenses.Answer 5: Weakly acid-fast, gram-positive branching filamentous bacilli describe a Nocardia infection, which can result in pulmonary and central nervous system infections in immunocompromised patients.Bullet Summary:The most common pathogen seen in corneal foreign body cultures is coagulase-negative, gram-positive cocci (staphylococci).
3.5
(4)
Please Login to add comment