SM 262: Bugs and Parasites Flashcards
What is the use of a KOH preparation?
Diagnose skin infections using skin scrapings
Detects: Tinea corporis, Tinea capitis, Tinea versicolor
What skin infections can be detected with KOH preparations?
Tinea corporis, Tinea capitis, Tinea versicoloris
What are Cimex Lectularius?
Bed bugs
Where do Cimex Lectularius bites occur, and in what pattern?
Cimex Lectularius bites occur on the face, neck, arms, and hands
See 2-3 lesions in a row/linear of erythematous pruritic macules
What is the Tzanck smear used for?
Herpesvirus
What are Sarcoptes scabiei?
Superficial mites that cause Scabies
Is Scabies contagious?
Yup - skin/skin contact
How does Scabies spread?
Skin-skin contact
How does Scabies present?
Pruritic papules, somewhat scaly, in “warm” areas of the body
Where does Scabies present?
“Warm” areas like the Axilla, genital regions, under socks/watches and webbing of hands and feet
What causes scrotal nodules?
Scabies unless proven otherwise
What is a Scabies burrow?
A classically scaly linear burrow in the skin that may or may not always be seen
Describe the life cycle of Scabies and how it relates to a Scabies burrow?
A female mite burrows into the top layers of the skin, forming a Scabies burrow, and lays eggs which are fertilized by the male
How do you diagnose Scabies?
Use a Scabies prep: microscopic examination of skin scrapings to reveal the mite or eggs
What is Norwegian scabies?
Scabies in immunocompromised patients, where thick scaly plaques form due to millions of Scabies mites colonizing the skin instead of just a 5-15
Why is Norwegian scabies confused with Psoriasis?
Both have scales, but Norwegian scabies occurs in immunocompromised patients and the scale arises due to extensive Scabies colonization; also, there’s no redness
How is Scabies treated?
Topical antiparistic meds like Permethrin for both the patient and all close contacts
What are Crab louse?
Head lice
What diseases can Crab Louse transmit?
Typhus, Trench Fever
What is Erythema Migrans?
The classic presentation of Lyme Disease with a large bullseye lesion
What is the cause and vector for Lyme disease?
Borrelia Burgdoferi on the Ixodes tick
How does Lyme Disease present?
An initial erythematous macule enlarges to form a large bullseye lesion
How can Lyme Disease be prevented?
Tick repellant with DEET and wear long pants
