Hello and welcome Lief.
>> Thank you.
>> So we'll talk about bacteria.
And the first question I would like to ask you is,
where do we find bacteria in an body and also out in nature?
>> Yeah, on the body we find the bacteria all over the skin.
In the mucosa of the upper airways and
the mucosa of the intestine, whereas the lungs and
the urinary bladder is the [INAUDIBLE] origins,
as well as the blood vessels and so on.
In the environment, we probably can find bacteria everywhere.
>> Okay.
So there's no place where you do not find bacteria?
>> I cannot imagine a place at the moment.
>> Okay.
So if we find bacteria everywhere, and it's on the body and,
why don't we just get sick all the time?
>> Because the bacteria we had at the skin,
in the intestines, and in all the airways.