00:01
Had in the question it is given that a sample from a superative skin wound was cultured and the person from the sample was collected did not respond to the antipiotic treatment.
00:17
So it is suspected that the infection is caused due to a gram positive organism that can ferment manitol.
00:27
So in this answer we are going to select an option which corresponds to a test.
00:32
Organism which is gram positive and ferment manitol.
00:39
So the fermentation of manitol can be checked by manitol salt agar which is a differential medium which can differentiate organism which ferment manitol.
00:52
In case of organisms which ferment manitol they produce acidic products which changes the color of the phenol red into yellow.
01:04
So the organisms which ferment manitol, they produce yellow colonies with the yellow zone.
01:13
So option a which says shigella species is a wrong option because shigella are gram -negative organisms while the suspected organism is gram -positive though it ferments manitone.
01:31
So option a is a wrong option.
01:34
Option c which says salmonella typhi is a wrong option because salmonella typhi is a gram negative organism though it fermens maniton.
01:47
It is given in the question that the suspected organism is gram positive.
01:52
So option c is a wrong option...