Microbiology

Question 1

N.Gonorrhoea optimal growth on which media?

Answer 1

Enriched blood agar-Thayer Martin

Question 2

Most common organism responsible for post operative endophthalmitis

Answer 2

Staph epidermidis

Question 3

Giemsa stain use?

Answer 3

Staining intracytoplasmic inclusion bodies as in Chlamydia
also stains fungi

Question 4

Which tissues do toxoplasma organisms survive best?

Answer 4

Brain and retina

Question 5

Most common organism associated with hypersensitivity marginal keratitis?

Answer 5

Staphylococcus epidermidis

Question 6

Normal commensals of eye?

Answer 6

Staph epidermidis> aureus>diphtheroids >Strep viridian,pneumoniae
Anaerobic- Propionibacterium acnes
Upto 100 fungal commensals
No viral commensals

Question 7

Most common cause of infectious conjunctivitis in adults?

Answer 7

Adenovirus, Herpes simplex, zoster

Question 8

Most common cause of infectious conjunctivitis in children?

Answer 8

Bacteria
H. influenzae, Strep. pneumoniae

Question 9

Cervical Ca associated with?

Answer 9

HPV-papovavirus
circular ds DNA
6,11-Low risk a/w conjunctival papilloma,SqCC of conjunctiva
16,18-High risk-a/w Conjunctival dysplasia,Cervical Cancer

Question 10

Single most important measure to prevent post operative endophthalmitis?

Answer 10

Thoroughly disinfect the lids and conjunctiva with an antiseptic such as povidone-iodine to eliminate commensal flora.