There are millions of bacteria on your skin and inside your mouth, nose, and lungs.
A great many live in your intestines.
Other kinds of bacteria live in the air, in water, or in the top layers of soil.
Bacteria, whether harmful or beneficial, can be spherical, rod-shaped, or spiral.
Each of these harmful bacteria causes a serious illness or disease.
Spherical bacteria
pneumonia
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKRg18O1Upnqr7_w4oFIWEwUYgO-qgiIszxRYMPEKO0ksua7I3uiyBCTHf9z8idcP4acUAmxazHyoLWcDLf17k8OtxPPfzIHWm-PissXj2r0menJ2PiF5bwf2U7vmk38PSdL9awl66pk8/s320/07_harmfull-bacteria+%283%29.jpg)
Boils blood poisoning
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXqp_RRyU-hK65fREijP9uFqnjZ95rddoEdJhNV4NqAiUQ92ZhYa9DRDu98KF9sSBpV036jGGJ37KbwcC7dv1e-0CsIoehGX39Zx73EWYquzD8G4B0HzIHJvB9AcsuwVcxeseepM9UDPQ/s320/07_harmfull-bacteria+%284%29.jpg)
Sore throat
Scarlet fever
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjonOc4mB_o2k4-RSWbR0fl6u-7E00PzVhZFYkXYaFdhnfEhyphenhyphenH9ygz-GqfcXIZpKABq9h2TqzZzwsRJ6U-9wnyuITeqyEE7zSwAD-1BML02PiC0_DWMGNCQPRwDGMDd77PS7uz7d9IWF4s/s320/07_harmfull-bacteria+%285%29.jpg)
Rod-shaped bacteria
Tuberculosis
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3eFUVKN5io9U9GaazJC9yHhbWNdBFlGbvq745aAVBGGsuKMNnPgM-07TZuzAQPIQ2Htakq2589X_uNDXUml64bA8S6Ic__m1IL3xpCmKBDjRV8IHn8n-HbuhaZHhBY2N8-GtSdYXaJDo/s320/07_harmfull-bacteria+%286%29.jpg)
Tetanus
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinCW0vwLr-gsdFAfcPcMofb0xPT0_8W0ihjdMmzD01oyuFsHALWoZU17hsDzzRrhZ57nKBzjExiaF4N-F9TxpK3DUNaMx6Hfd60RF3gDoRdUbCwUtMPW4WOZiL-5cDb58DUKJuMgkIXgE/s320/07_harmfull-bacteria+%287%29.jpg)
Typhoid fever
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMkNm8o9nk1eXN6pMR2eT-5X5gvyHaAIBjvfif-68ct9n3AXq6zI0Uu-t6OK3La_lQeqVjWVIu8xfXykwSqgRZXE2m6AipOuL09EC6PUEIWS44qUa7bUfRzKMDO9D6LWsbd9tO0Ch6XuY/s320/07_harmfull-bacteria+%281%29.jpg)
Spiral bacterium
Cholera
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhh-Wz4yQ-lcKyR2IlgIuO4FzILQVzIkT4kjcJxcz4ajONtntKjlRxuk0pf_xc72Pw4pac4PIwOdAFab4fdeWtGKxECUiMLJDXr2JksxtM_JQBfbUqKu01kTQfWfeUNQs0zcr06lVIU_Jc/s320/07_harmfull-bacteria+%282%29.jpg)
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