Micro Lecture 3/4

Question 1

How does chlamydia cause blindness

Answer 1

Damage is due to scraping of the cornea, not the actual infection

Question 2

Does the eye have pain or visual loss with keratitis

Answer 2

Yes

Question 3

Presentation of ocular gonorrhea in an adult

Answer 3

Fountain of puss out of the eye after wash

Question 4

Causative agents of onchocerciasis

Answer 4

Onchocerciasis volvulus - filaria transmitted via black fly; worm dies and releases wolbachia spp

Question 5

What type of conjunctivitis is associated with URI

Answer 5

Viral conjunctivitis

Question 6

Inflammation of cornea

Answer 6

Keratitis

Question 7

Disease process associated with pseudodendritic keratitis

Answer 7

Herpes zoster/shingles/VZV

Question 8

Most common infections conjunctivitis

Answer 8

Adenovirus

Question 9

Body sites affected by chlamydia

Answer 9

Mucosal epithelial cells

• urethra
• eye
• lung

Question 10

What chlamydia serotypes are responsible for majority of blindness around the world (trachoma)
- and what are they transmitted by

Answer 10

A, B and C

- transmitted by fly

Question 11

Inflammation of the conj

Answer 11

Conjunctivitis

Question 12

Does the eye have pain or visual loss in conjunctivitis

Answer 12

Neither

Question 13

Commonality between a canthal ONeal keratitis and bacterial keratitis

Answer 13

Both common in CL patients

Question 14

2 key clinical observations of loa loa

Answer 14

• calabar swelling

- worm in the eye

Question 15

What is tzanck prep used for

Answer 15

To rule out herpes

Question 16

Causative agent of Loa Loa

Answer 16

African eye worm

- Fly ingests microfilariae and bite humans

Question 17

Does chlamydia have a cell wall

Answer 17

No

Question 18

What is a dendritic keratitis

- what causes it?

Answer 18

has a dendritic branching pattern

• HSV
• cold sore of the eye*

Question 19

Which is diagnostic for chlamydia, elementary or reticulate bodies

Answer 19

Reticulate bodies

-non infectious

Question 20

Symptoms of viral conjunctivitis

Answer 20

• Follicular (clear domes)
• Watery/mucoid discharge
• usually unilateral

Question 21

Body sites affected by chalmydophila

Answer 21

Respiratory sites

- lungs

Question 22

Which presents with a worm in the eye, loa loa or onchocerciasis

Answer 22

Loa loa

Question 23

Most common cause of infectious conjunctivitis

Answer 23

Adenovirus

Question 24

Most common source of bacterial keratitis

Answer 24

Sta. Aureus and Ps. Aerouginosa

Question 25

Potential consequences of failure to treat gonorrhea

Answer 25

• Corneal rupture/perforation
• ulcerative keratitis
• visual loss
• ***treat quickly

Question 26

What type of stain is a tzanck cell

Answer 26

WG stain

- look for multinucleated cells

Question 27

Top 2 eye-related warning signs that require immediate action

Answer 27

Ocular pain and vision loss

Question 28

Leading cause of blindness

Answer 28

Trachoma

Question 29

What is the gram stain description for pseudomonas aerouginosa

Answer 29

Gram - rod

• also grows on blood and chocolate
• non lactose fermenter (colorless on macconkey)
• oxidase positive

Question 30

Cold sore on the eye

Answer 30

HSV keratitis

Question 31

Which form of chlamydia is infectious, elementary or reticulate bodies

Answer 31

Elementary bodies

Question 32

Why aren’t all viral infections of the eye treated equally?

Answer 32

• Most will resolve with little/no Tx

- viruses like HSV need to be treated aggressively to prevent HSV keratitis

Question 33

Symptoms of bacterial conjunctivitis

Answer 33

• Papillary or nonspecific (cobblestone)
• mucopurulent (thick) discharge
• probably bilateral

Question 34

What is the gram stain description for staph aureus

Answer 34

Gram + cocci (cat and coag + too)

Question 35

Most common bacterial conjunctivitis

Answer 35

C. Trachomatis

Question 36

Commonly seen in fungal keratitis

Answer 36

Aspergillus (elevated lesion)

Question 37

Which can lead to blindness, loa loa or onchocerciasis

Answer 37

Onchocerciasis