Question

what is the bacteria of that is gram negative, acid fast negative, and endospore forming? there is growth on blood and macconkey not MSA.

options:

1, salmonella pulloram

2, enterobacter aerogenes

3, strep. mutans

4, micrococcus luteus

5, mycobacterium smegmatis

6, bacillus subtilis

7, staph. aureus

its actually non-endosporing

Answer 1

The answer is option 1 - Salmonella pullorum

Salmonella pullorum is a rod-shaped, gram-negative bacteria that do not form endospores. They are non-acid-fast bacterium (acid-fast negative). They grow on blood and MacConkey agar. They are non-halophilic and the growth is poor on MSA (Mannitol salt agar)

Enterobacter aerogens is a rod-shaped, gram-negative bacteria that do not form spores. They are acid-fast negative. They grow on MSA. They grow on blood and MacConkey agar. So option 2 is incorrect

Streptococcus mutans are anaerobic bacteria found in the mouth of humans. They are gram-positive bacteria. So option 3 is incorrect

Micrococcus luteus are gram-positive, acid-fast negative bacteria that do not form endospores. So option 4 is incorrect

Mycobacterium smegmatis is a rod-shaped, gram-positive bacteria. So option 5 is incorrect

Bacillus subtilis are rod-shaped, gram-positive bacteria that form spores. So option 6 is incorrect

Staphylococcus aureus is a round-shaped, gram-positive bacteria. So option 7 is incorrect