1. INTRODUCTION
2. CONCEPT OF COMMUNICABLE DISEASES
   2. 1 COMMUNICABLE DISEASES
   2. 2 CHAIN OF INFECTION
   2. 3 PATHOGENS / RESERVOIR

2.3.1 Pathogens

2.3.2 Reservoir

2. 4 MODE OF TRANSMISSION

2.4.1 Contact transmission

2.4.2 Droplet transmission

2.4.3 Airborne transmission

2.4.4 Common vehicle transmission

2.4.5 Vector-borne (insects) transmission

2. 5 SUSCEPTIBLE HOST
3. PREVENTIVE MEASURES AGAINST COMMUNICABLE DISEASES 
   3. 1 PRINCIPLES OF PREVENTION AND CONTROL OF COMMUNICABLE DISEASES
   3. 2 GENERAL HYGIENE PRACTICES
   3. 3 STANDARD PRECAUTIONS AND TRANSMISSION-BASED PRECAUTIONS

3.3.1 Standard precautions

3.3.2 Transmission-based Precautions 

3. 4 VENTILATION 

3.4.1 Purpose of ventilation 

3.4.2 General ventilation design 

3.4.3 Infection control measures and ventilation issues 

3.4.4 Maintenance of Mechanical Ventilation Systems