Name: What is TB? | Infectious diseases | NCLEX-RN | Khan Academy
Uploaded: 2017-03-15T10:44:09.000Z
Duration: 12 min 27 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

I've drawn out for you a mother over here,

And it turns out that mom has tuberculosis,

And sometimes when you see "Tuberculosis"

or kind of use the quick way of saying it,

Now, this is actually a diagnosis, right?

This is telling us what she actually has,

But we have to remember that tuberculosis is

It's actually caused by a bacteria, it turns out.

And this bacteria has the name "Mycobacterium".

So this is actually a very easy one to remember,

because "tuberculosis" is right here in the name.

Now I should point out Mycobacterium Tuberculosis

is actually not the only cause of tuberculosis.

It turns out there are few other kind of related

mycobacterium, using this word "myco", that also cause TB.

But this one, the one I wrote out for you,

this is definitely the most common around the world,

and that's the one I'm going to focus on.

And in fact this "myco", this is actually Greek

And the reason that this is here actually kind of tells us

a little bit about how this bacteria grows,

because it grows really slowly, like a fungus,

and that's actually the reason that they use the term "myco".

But nevertheless it is a bacteria, and so if we're going to

put a little bracket around the diagnosis,

I also want to put a little bracket around this part,

So now let's talk about how mom, who we said already

is sick with TB... I'm going to actually just

sketch out what her lungs might look like,

This is actually the most common place we think of

But let's say that she's got little red, I'm going to draw it

in red, bacteria here in her lungs, causing her to be

But what are the different ways that she might spread it?

Well, let me sketch out a few possibilities,

and we're going to go over whether these possibilities

are very likely or unlikely to be a way for her

Let' say first they are sharing this delicious pizza

I'm drawing here. Let's say they are very into pizza

and they like to share food, and they both chow down

on this little pizza here, that's one way they might

potentially you might think of as a way to spread it.

Maybe there is a drink here, and they are sharing again.

You might also think about what's going on

in their house: maybe they're opening and closing doors,

there is another way, right, maybe they're touching stuff

"Hey, here, grab these keys" and she's been holding

the keys all day, and then she gives him the keys

There is another way, maybe the TB can touch objects

in the environment, like a door knob or a key.

you might be thinking: maybe she's coughing,

maybe she has a loud cough, maybe she's coughing

all day and some of these bacteria get in the air.

That's another way that you might imagine that the

bacteria could spread from her to her son.

So different ways, right. Now, of these ways,

I'm actually going to label this one over here,

Which are the most common ways to be really concerned

I'm actually going to just put it in green,

So in this case the first person would be mom,

because she is sick, and it's going to go

And these other ways, for example food and drink,

that's really not so common, that's really really unlikely

even this down here is really not likely either.

So the idea of getting TB by sharing food and drink

like the keys or the door knob, or things like that,

that's really not how TB spreads usually.

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What is TB? | Infectious diseases | NCLEX-RN | Khan Academy

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