CD - tuberculosis - part 2

Question 1

what are the features of smear- and culture-positive TB (S+C+) - re: microscopy, transmissibility, symptoms (3)

Answer 1

1- AFB seen under
microscope directly
from a sputum sample
2- highly transmissible
3- symptomatic

Question 2

what are the features of smear-negative and culture-positive TB (S-C+) - re: microscopy, transmissibility, symptoms (3)

Answer 2

1- AFB not seen under direct microscopy but when placed on appropriate media, TB
organisms grown on culture
2- less transmissible but still infectious
3- usually symptomatic unless immunocompromised

Question 3

what are the features of non-respiratory TB - re: microscopy, transmissibility, symptoms (3)

Answer 3

1- no microscopy - blood/serum or biopsy sample
2- rarely transmitted
3- symptoms based on affected organs

Question 4

how do you prioritize TB contacts based on source case infectiousness - what are 3 features of highly infectious TB - LSC (3)

Answer 4

1- laryngeal TB
2- sputum positive TB
3- cavitary disease

Question 5

how else do you prioritize TB contacts - HEP (3)

Answer 5

1- host’s vulnerability
2- extent of exposure to case
3- progression - risk of progression to active TB if infected