Bacteria is a type of biological cell. They constitute a large domain of prokaryotic microorganisms . Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria also live in symbiotic and parasitic relationships with plants and animals. Most bacteria have not been characterised, and only about half of the bacterial phyla have species that can be grown in the laboratory. The study of bacteria is known as bacteriology, a branch of microbiology.
ប្រភេទស្លាយរៀបចំរបស់យើងមានប្រភេទជាច្រើននៃបាក់តេរី។ ដូចជាការ meningococcus, pyogenes ហើយដូច្នេះនៅលើ Streptococcus ។ អ្នកអាចពិនិត្យមើលតម្រូវការរបស់អ្នកសម្រាប់ការកាតាឡុករបស់យើងអំពីបាក់តេរី។