Bacterial is a unicellular orgainzm catergorized under kingdom protista. with the help of microscope you can see varies types of bacterias like rods, balls or spirals. most of them are not cause any disease in human beings. only 1% of them are harmful. when bacterial enter into the body, it reproduce very fastly . and they produces chemicals known by the name toxins., which may cause damage to tissue.

The disease causing bacterias including staphylococcus, streptococcus and e coli etc. for preventing bacterial infections we use antibiotics. when you take treatment with antibiotics you should follow the directions very carefully. if you follow wrong instructions , bacteria in your body will resist the antibiotics. after this antibiotics cannot cure infections.antibiotics are classified into two, bacteriacidal and bacteriostatic. the first one kill bacteria and the second one prevent the growth of bacteria. the antibiotics such as tetracyclins and chlorophenicol inhibit the ribosome of bacteria. anitibiotics are used for the treatment both in humans and animals. for preventing bacterial infections we always sterilize our skin before taking an injection. the surgical instruments are sterilized with antibiotics to prevent bacterial infections. most of the bacterias are killed if the cooking temperature is greater than 73 degree celcius.