q2 - darkhorse

[ArchivalUser]

Which of the following contacts with a patient infected with tuberculosis is most likely to develop the
disease?
A. The child of a parent with smear-negative, culture-positive pulmonary tuberculosis
B. The co-worker in a small office of a patient with laryngeal tuberculosis
C. The HIV-negative partner of an HIV-infected patient with pulmonary tuberculosis
D. The parent of a young child in diapers with renal tuberculosis
E. The spouse of a patient with miliary tuberculosis

[ArchivalUser]

Ee

[ArchivalUser]

is ans e ..please tell

[ArchivalUser]

The answer is B.


M. tuberculosis is spread by droplet nuclei that are aerosolized by coughing, sneezing, or speaking. The
droplets dry quickly and may stay airborne and subject to inhalation for hours. The probability of
acquiring tuberculosis is related to the degree of infectiousness and the intimacy and duration of contact.
Smear-positive patients have the greatest infectivity. Patients with cavitary, laryngeal, or endobronchial
disease produce the most infectious organisms. Patients with smear-negative/culture-positive or
disseminated disease are less infectious. Patients with culture-negative (treated) or extrapulmonary
tuberculosis are essentially noninfectious. Patients with tuberculosis who are HIV-infected also appear to be less infectious because of the lower frequency of cavitary disease. These factors emphasize the
importance of public health measures to control the transmission of tuberculosis.

[ArchivalUser]

thanks good qs