PRINCIPLES OF INFECTION

Potential infectious micro-organisms

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• Bacteria
• Fungi
• Viruses
• Parsasites

BACTERIA

• Microbes or germs
• One-celled micro-organisms
• Plant and animal characteristics
• Exist almost anywhere
• Can only be seen with a microscope

2 types:
Nonpathogenic - helpful/ harmless
Pathogenic- harmful/disease producing invade plant or animal tissue

CLASSIFICATIONS OF PATHOGENIC BACTERIA

• 1. Cocci
• Staphylococci
• Streptococci
• Diplococci
• 2. Bacilli
• 3. Spirilla

Movement of bacteria

Cocci

Bacilli& spirilla

SPIRILLA

BACILLI

GROWTH AND REPRODUCTION

BACTERIAL INFECTIONS

• Staphlococci
• Local infection
• Systemic infection or disease
• Contagious or communicable

VIRUSES

BLOODBORNE PATHOGENS

• 1. Hepatitis A
• 2. Hepatitis B
• 3. Hepatitis C
• 4. HIV/ Aids

FUNGI

PARASITES

HOW DO PATHOGENS ENTER THE BODY?

HOW DOES THE BODY FIGHT PATHOGENS.

IMMUNITY