1. Sources of infection
1.1. Environment
1.1.1. Land and water ,soil
1.2. Human
1.2.1. Carrier ,causes , contact with infected person
1.3. Animal
1.3.1. New node
2. Classification
2.1. Duration
2.1.1. Acute
2.1.1.1. Develops and run quickly
2.1.2. Chronic
2.1.2.1. Develops more slowly
2.1.3. Latent
2.1.3.1. No symptoms between outbreak of illness
2.2. Location
2.2.1. Local
2.2.1.1. Specific areas of body
2.2.1.1.1. Pain redness swelling heat
2.2.2. Systemic
2.2.2.1. Generalized of the body
2.2.2.1.1. Fever chills vomiting
2.3. Timing
2.3.1. Primary
2.3.1.1. Initial infection ( اول ماتظهر العدوى وقبل كان الانسان صحي )
2.3.2. Secondary
3. Information
3.1. Can't be seen with eye only under microscope
3.2. Some microorganism capable of causing disease ( pathogen )
3.3. New node
3.3.1. New node
4. Recovery
4.1. Tissue heal , body strength
4.1.1. New node
5. Types of infection
5.1. Acute
5.1.1. Short duration
5.2. Chronic
5.2.1. Long duration
5.3. Latent
5.3.1. Come and go
5.4. New node
6. Phases
6.1. Incubation ) فترة الحضانة
6.1.1. وقت أخذ العدوى وظهور العلامات ) time between infection and symptoms
6.2. Prodromal
6.2.1. Mild non specific symptoms ) تظهر العلامات بس بشكل عام
6.3. Clinical
6.3.1. تظهر العلامات الخاصة بهذا المرض typical sings and symptom
6.4. Decline
6.4.1. Subsidence of symptoms اختفاء الأعراض
7. Characterization
7.1. Shape
7.1.1. Round , rod , spiral , irregularly ( single or clusters , chains )
7.2. Requirements
7.2.1. Need for oxygen
7.2.1.1. Aerobic
7.2.1.1.1. ينمو في وجود الأوكسجين
7.2.1.2. Anaerobic
7.2.1.2.1. ينمو في عدم وجود الأوكسجين
7.2.2. Temperature
7.2.2.1. Growth in body temperature في درجه الجسم العاديه ينمو
7.2.2.2. Killed by excess temperature يموت في الدرجه العاليه
7.2.2.3. Dormant at excess temperature مايتاثر أبدا بالدرجه العالية
7.2.3. Light
7.2.3.1. New node
7.2.4. Food
7.2.5. Moisture