Infections of the sensory system

Question 1

What are the ocular defence mechanisms?

Answer 1

• Eyelids
• Lacrimal system
• Conjunctiva
• Cornea
• Blood-ocular barrier

Question 2

What are the common pathogens causing bacterial conjunctivitis?

Answer 2

• Haemophilus influenza
• Streptococcus pneumonia
• Moraxella spp.

Question 3

What are the common pathogens causing neonatal bacterial conjunctivitis?

Answer 3

• Neisseria gonorrhoea
• Escherichia coli
• Staphylococcus aureus
• Haemophilus influenza
• Chlamydia tachomatis

Question 4

What is the common hospital acquired cause of bacterial conjunctivitis?

Answer 4

Pseudomonas aeruginosa

Question 5

What are the clinical features of bacterial conjunctivitis ?

Answer 5

• hyperaemic red conjunctivae

* Mucopurulent discharge

Question 6

What samples should you take for a bacterial conjunctivitis?

Answer 6

• Conjunctival swab
• Corneal scraping
• NAAT and culture from lab

Question 7

What is the treatment of bacterial conjunctivitis?

Answer 7

• Fusidic acid
• Tetracycline
• Chloraphenicol

Question 8

Adenovirus causing bacterial conjunctiviits

Answer 8

• Purulent conjunctivitis
• Enlargement of ipsilateral periauricular lymph nodes
• May have corneal impairment
- punctate keratitis
- sub epithelial inflammatory infiltration
• Symptomatic treatment
• Avoid topical steroids (they reduce the inflammation but suppress the immune system meaning it takes longer to get rid of infection)

Question 9

Clinical features of VZV infection

Answer 9

• Skin lesion
• Anterior uveitis
• Ocular perforation
• Retinal involvement

Question 10

what are the clinical features of HSV infection?

Answer 10

• Ulceratuve blepharitis
• Follicular conjunctivitis
• Regional lymphadenopathy
• Corneal involvement