Bacteria can cause a variety of infections and diseases in humans, such as strep throat and tuberculosis. While some bacteria are helpful in food production, others can be harmful by releasing toxins that damage tissues. Bacteria were first discovered in the late 1600s by Antony van Leeuwenhoek and reproduce by splitting into two or forming spores. They are found nearly everywhere and while mostly harmless, a small percentage can make humans sick.

1. Why do bacteria
make and infection
on humans?
By: Joana c

2. What is a bacteria?
Bacteria's are a human digestive tract collectively
called gut flora. Bacteria's are also small things
that can be anywhere you touch. There are lots
and lots of bacteria's around the world. Many
people get sick because of the bacteria. As you
could see bacteria can cause you illness too. The
air is also filled up with bacteria . Bacteria's are
also living things that have only one cell less than
1% makes people sick

3. What infections or diseases
do bacteria make on humans?
Bacteria can make any type of infection or
diseases. Some of the diseases that bacteria
can make are strep throat, tuberculosis,
urinary tract infections . Bacteria is not a
good thing to have cause it causes many
damages.

4. Who found bacteria and when
was it discovered.
Bacteria was first discovered in the late 1600s
somewhere around the 1670s. Antony van
Leeuwenhoek was the first man who
discovered bacteria.

5. Can bacteria be reproduce?
 Yes bacteria's can be reproduce.
Bacteria's reproduce by splitting into 2 or
produce spores. To split they need the right
resources to live and may produce up to four
generations in one hour. Also bacteria's are in
general about 0.1 in diameter and 10.0 in
length.

6. Are bacteria's harmful or
not
 Well there are some helpful bacteria's that
help make healthy food. Some of the foods
these help make are yogurt, and cheese.
There is also harmful that can cause you bad
things to any part of your body . Some
bacteria's make you illness many give off
chemicals called toxins which can damage
tissues and make you sick.

7. Can we killed bacteria's?
 Well we could kill bacteria's by washing our
hands and be careful were ever you touch.
There will always be bacteria's every were
remember that. There is 3 to 4% of people
that die because of the bacteria. Some other
people get scared that they will die too
because of bacteria's.

8. Does it only happens to
human?
 No not only to humans get bacteria's animals
get bacteria's too. For them is almost the
same thing they get disease on their skin
because of the bacteria

9. Information
Bacteria's are some things that can cause us
damage in our body. Specially in our skin
Gas can only be made by bacteria's. Bacteria's
are so not good have in our bodies .
Bacteria's are also prokaryote . So as you
could see bacteria's makes infections on us
we just have to be careful of caching them.
We should never forget to be clean.

10. My resources
www.google.com
www.ask.com
http://biology.clc.uc.edu/courses/bio106/bact-
dis.htm
http://www.ucmp.berkeley.edu/history/leeuwen
hoek.html
http://wiki.answers.com/Q/Are_bacteria_prokar
yotic_or_eukaryotic