Let's look at the incidence of parasitic infections worldwide.
Many many people acquire these infections and I suspect that
these numbers on this slide are probably an underestimate.
Way at the top, toxoplasmosis. One to two billion people,
probably more, are infected with toxoplasma.
I think most of them are fine but again
in immunosuppressed individuals it can be a problem.
Many people have ascariasis worms, hookworm, amebiasis,
schistosomiasis and malaria in a hundreds of millions.
Strongyloides. Guinea worm infection is not what we talk about.
This is nearly been eradicated.
And this is spread by contaminated water.
And the carter foundation has led a very big effort
which has brought this down to almost zero.
These are all called neglected tropical diseases because
they typically occur in tropical countries that are underdeveloped
and they don't get much attention. There's now a big effort
globally to raise money to research into these diseases
and to come up with either preventions
or drugs that can cure them.
So I hope now that after you've listened a bit about parasite,
you can tell me the definition of a parasite.
You understand exactly what a zoonosis is.
You should be familiar with the different types
of protozoan and helminthic parasites.
And you should have an overview of
how parasitic infections are transmitted.
I hope you enjoyed that. Please take care of your food
and we'll see you next time.