16- Mycobacterial

Question 1

Tuberculin testing becomes positive how many weeks after infection?

Answer 1

2-10 weeks

Question 2

Tuberculin test is read _____ after ID injection

Answer 2

48-72h

Question 3

Appears 2-4 weeks after inoculation

Painless brown red papule—indurated nodules or plaque and may ulcerate

Regional lymphadenopathy after 3-8 weeks
Spontaneous healing after 1 year

Answer 3

Tuberculous chancre

Primary inoculation TB

Question 4

Exogenous inoculation of bacilli into skin of a previously sensitized person with strong immunity against M. tuberculosis

Papule—hyperkeratotic like a wart, enlarged through peripheral expansion

Dorsa of fingers and hands in adults

Answer 4

Tuberculosis verrucosa cutis

Question 5

May appear at sites of inoculation, scrofuloderma scars or distant sites through hematogenous dissemination

Single plaque composed of grouped red brown papules, “apple jelly” color when blanched

Answer 5

Lupus vulgaris

Question 6

Tuberculous involvement of the skin by direct extension from an underlying focus of infection

Most often in cervical lymph nodes
Suppuration occurs centrally
Heals with characteristic cordlike scars

Answer 6

Scrofuloderma

Question 7

Erythematous, tender, subcutaneous nodules that favor the posterior lower calf

Lesions resolve spontaneously
Middle aged women-80%

Answer 7

Erythema induratum