Name various diseases caused by protozoans.

(N/A) Various species of protozoans cause diseases in humans. Some examples are:
$1$. $Trypanosoma$ causes sleeping sickness.
$2$. $Leishmania$ causes kala-azar (dum dum fever).
$3$. $Giardia$ causes giardiasis.
$4$. $Trichomonas$ causes trichomoniasis (often associated with leucorrhoea).
$5$. $Plasmodium$ causes malaria.
$6$. $Entamoeba$ $histolytica$ causes amoebic dysentery.