Welcome everybody! My name is Zohir Chowdhury, and today we'll talk about biological contaminants in
water so what biological organisms contaminate water there are mostly four different types of
organisms and they are bacteria protozoa viruses helmets or other parasites viruses
and bacterias are pretty well known viruses are non cellular effectively inactivated by
chlorine as it applies to the water quality scenario and because there is really small in
order to remove them it's relatively difficult and in typical filtration mechanism they are
not filtered well diseases that are water related are gastroenteritis hepatitis A and E as well as
polio which are all virus related diseases virus cause diseases related to water on the other hand
bacteria bacterias are prokaryotic organisms effectively inactivated by adding chlorine in
the water and because of its size about one micrometer in size it is filterable using
common filters in water water treatment diseases that are caused by bacteria are gastroenteritis
or diarrhea typhoid fever and cholera the next set of organisms are protozoa and helmets or
parasitic worms so protozoa us have a relatively have a life cycle that they must spend a small
part of their life cycle in an animal host and by doing that they complete their life cycle and they
exist in the intestines of this animal host and it figure released to the excrement and they go
into the environment they are relatively large approximately 10 micrometers in diameter and
as a result easily filterable of course when you add chlorine protozoa do get inactivated however
the cysts form which is a highly resistant form can resist chlorination and essentially once the
environment becomes more suitable the cysts can be transformed into the active protozoa
example of diseases that are caused by protozoa are keeps cryptosporidiosis any biases as all
as giardiasis prosthetic worms or helmets as the gnomon resume me implies they are a parasite they
live inside the host and feed off living host while disrupting the host nutrient absorption
capability causing weakness and disease so they don't kill the house because if they
were to kill the host they would have to find a new host every time so they actually weakened
the host and make the host as their home but the parasitic worms are productively big so they can
be filtered and they are inactivated by chlorine diseases caused by parasitic worms our tapeworm
diseases roundworm diseases as well as guinea worm disease so quick classification of water related
infection so water infection can happen whether it is waterborne or water wash or water washed
washed or water scarce or water-based as well as water related insect factor related diseases
so four different classification of water level infections the waterborne up of diseases typically
the pathogen is in the water that is ingested and example of diseases would be hepatitis A
or cholera on the other hand water washed or water scarce diseases would happen when pursuit
of personal transmission happens because of the lack of water for hygiene an example would be
GID asses a third classification of water related infection is water-based diseases and typically
the transmission by an aquatic intermediate host such as guinea worm disease water related insect
factor diseases they happen when transmission by insects that breathe in water or bite near
water come in contact with human in this case malaria or yellow fever a good example and this
table provides a table where you can look at the various kind of diseases there are water
related in this column you have some of the major diseases that are virus caused in here bacteria in
protozoa and in-ear parasites or worms could give some examples gastroenteritis caused by norovirus
gastroenteritis caused by rotavirus as well as hepatitis A caused by happy virus and how about
it is it caused by have a virus they are all virus elated water related diseases bacteria
caused diseases that are water related cholera typhoid salmonellosis gastroenteritis future
losses campylobacteriosis tularemia as well as legionellosis and in parentheses you can see the
specific bacteria that causes the disease protozoa some examples at giardiasis cryptosporidium
amebiasis as well as toxoplasmosis and then from the parasitic worms we already covered a few such
as dragoon Cooley asses or also known as guinea worm disease sister so masses malaria uncle Cersei
asses ascariasis or ramadan disease and then the tapeworm disease or tennessee asses ok so
that concludes the lecture so let's do some quick concept check which of the following microorganism
is effectively inactivated by adding chlorine in the water that's correct all of the above viruses
bacterias and protozoa are all effectively inactivated by chlorine so the answer is deep
which of the following water related disease is caused by a parasite d sister so myiasis
very good viruses can typically be filtered during water treatment process false that's all