runyon groups

Question 1

Mycobacteriaceae

Answer 1

mycobacterium is the sole genus
prior to 1950’s only 3 known species of clinical significance
m. bovis, m. tuberculosis, mac

Question 2

Group 1

Answer 2

Photochromogens

Question 3

Group 2

Answer 3

Scotochromogens

Question 4

Group 3

Answer 4

Non-photochromogens

Question 5

Group 4

Answer 5

Rapidly growing mycobacteria

Question 6

Photochromogens

Answer 6

synthesize carotenoid pigments when exposed to light

OXYGEN IS ESSENTAL

Question 7

M. kansasii

Answer 7

10-21 days
chronic cavitary pulmonary lesion
yellow bacillus
extrapulmonary infections
cording is seen
3% of infection
dark red crystals after prolonged exposure

Question 8

M. simiae

Answer 8

pulmonary disease resebling TB

Question 9

M. marinum

Answer 9

aquatic
swimming pool bacilli
opportunistic
extremities skin ulcers
optimum 30-33

Question 10

Schotochromogens

Answer 10

pigment in both light and dark

“scoto” greek- in the dark

Question 11

M. szulgai

Answer 11

scoto @ 37, photo @ 25
disease similar to TB
cervical lymphadenitis
chronic pulmonary infection

Question 12

M. scrofulaceium

Answer 12

cervical lymphadenitis in children

rarely causes pulmonary disease

Question 13

M. gordonae

Answer 13

10% of all atypical isolates
TAP WATER CONTAMINANT
inefficient decontaminant prcedure

Question 14

M. Flavescens

Answer 14

Tap Water bacillus

intense yellow pigment

Question 15

Non-photchromogens

Answer 15

MAC, M. xenopi, M. malmosense, M. haemophilum, M. branderi, M. celatum, m. genevensi, M. gastri, M. terrae complex

Question 16

M. avium and M. intracelllulare

Answer 16

known together as m. avium complex
intracellulare "battery bacillus"
Major pathogen of AIDS, immunocomp, elderly
pleomorphic 
many morphotypes

Question 17

m. xenopi

Answer 17

opportunistic
disseminated disease in AIDS
grows best at 42 (so does m. celatum)

Question 18

m. haemophilum

Answer 18

requires hemin
grows best at 30, slow grower
causes skins lesions and skin/joint disease

Question 19

m. genavense

Answer 19

isolated from AIDS pateints from blood, spleen, and bone marrows
no growth on solid media
id by molecular

Question 20

saprophytes (non-photochromogens)

Answer 20

m. gastri, m. terrae complex- terrae, triviale, nonchromogenicum

Question 21

Rapid Growers

Answer 21

M. fortuitum, M. cheonae, M. abscessus, M. phlei, M. smegmatis, M. thermosresistible, M. vaccae

Question 22

M. fortuitum

Answer 22

Opportunistic pathogen, post-op, post-traumatic inoculation

Question 23

M. abscessus

Answer 23

ear, skin infection

Question 24

Saprophytes (Rapid growers)

Answer 24

M. PHeli, M. smegmatis, M. thermoresistible

Question 25

Non-runyon

Answer 25

M. ulcerans- 30 C, rarely seen, subcutaneous lesions (buruli ulcer) MTB complex M. tuberculosis, M. bovis, M. africanum, M. microti, M. canettii

Question 26

MTB complex

Answer 26

Human Pathogens | Culture confirmation using Accuprobe, nucleic acid amplification test,