- nfection-Sources of infection, method of transmission of infection,Factors predisposing to microbial pathogenicity,Types of infectious diseases..Normal Microbial flora of human body. Gram positive pathogens Staphylococcus,Streptococcus, ,Corynebacterium,Clostridium.
- Gram negative pathogens- Neisseria,E.coli,Klebsiella,Proteus,Salmonella,Shigella,Vibrio,Yersinia.
- Acid fast bacteria-Mycobacterium tuberculosis and M.lepreae.
- Spirochetes-Leptospira, Treponema.
- Mycoplasma.Chalmydia.Helicobacter and Campylobacter.
- Other important anaerobic pathogens.