How are bacteria categorized1

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• Subtopic: How are bacteria categorized? Bacteria are categorized into four main categories: **Type 1: Shape** As previously mentioned, bacteria come in many shapes: some are spherical and round, others are like sticks or rods, and some look like a comma. **Bacteria** - Sphere-shaped (cocci) - Rod-shaped (bacilli) - Spiral-shaped (spirochetes) **Type 2: Gram Staining** Bacteria can be identified as Gram-positive or Gram-negative when subjected to a special dye that changes color depending on the bacteria. **Type 3: Oxygen Requirement** Some bacteria require oxygen to live, while others do not. The bacteria that need oxygen are called Aerobic bacteria. Those that do not need oxygen are called Anaerobic bacteria. Bacteria that can live with or without oxygen are called Facultative bacteria. --- • Subtopic: Examples of Bacterial Diseases **Tuberculosis (TB):** Shape: Rod-shaped Symptoms: Cough, weight loss, night sweats, fever, fatigue **Pneumonia:** Shape: Spherical Gram: Positive Symptoms: Fever, cough with phlegm, chest pain, respiratory difficulties **Cholera:** Shape: Comma-shaped Gram: Negative Symptoms: Watery diarrhea, dehydration, low ...