Bacteria Causing Diseases in Man

A number of diseases are caused by bacteria in man. Some common diseases and their causative bacteria are given below:

Pneumonia

1. Staphylococcus aureus (most common cause of hospital acquired pneumonia)
2. Streptococcus pneumoniae (community acquired pneumonia)
3. Streptococcus agalactiae (neonatal pneumonia)
4. Moraxella catarrhalis
5. Klebsiella
6. Enterobacter
7. Serratia
8. Proteus
9. Pseudomonas
10. Haemophilus influenzae
11. Nocardia asteroides

Atypical Pneumonia

1. Legionella
2. Mycoplasma
3. Viral e.g. influenza
4. Psittacosis
5. Q fever
6. Chlamydia pneumoniae

Septicemia (Sepsis)

1. Streptococcus agalactiae (neonatal)
2. Staphylococcus epidermidis (neonatal)
3. Staphylococcus aureus
4. Neisseria meningitidis
5. Streptococcus pneumoniae
6. Listeria monocytogenes
7. Salmonella
8. Haemophilus influenzae
9. Bacteroides
10. Vibrio vulnificus (immune compromised)

Gastroenteritis

1. Staphylococcus aureus
2. Bacillus cereus
3. Clostridium perfringes
4. Listeria monocytogenes (febrile)

Endocarditis

1. Viridins group
2. Staphylococcus epidermidis
3. Staphylococcus aureus
4. Enterococcus faecalis
5. Streptococcus bovis
6. Serratia
7. Pseudomonas (in I/V drug users)

Conjunctivitis

1. Staphylococcus aureus
2. Streptococcus pneumoniae
3. Haemophilus influenzae
4. Chlamydia trachomatis
5. Neisseria gonorrhoea (neonatal)
6. C. trachomatis

 Urinary Tract Infection

1. E. coli (community acquired)
2. Staphylococcus saprophyticus (community acquired)
3. Enterococcus faecalis (hospital acquired)
4. Enterobacter cloacae
5. Klebsiella pneumoniae
6. Serratia marcescens
7. Proteus mirabilis
8. Pseudomonas aeruginosa

Pharyngitis

• Streptococcus pyogenes

Meningitis

1. Streptococcus pneumoniae
2. Neisseria meningitidis (most common cause in ages 2-18 years)
3. Haemophilus influenzae

Neonatal Meningitis

1. Streptococcus agalactiae
2. E. coli
3. Listeria monocytogenes

Diarrhoea

1. E. coli
2. Vibrio cholera
3. Salmonella
4. Shigella
5. Campylobacter
6. E. coli (enteropathic) O157:H7
7. Yersinia enterocolitis
8. Vibrio parahemolyticus

Dysentery

• Shigella

Sexually Transmitted Diseases

1. Neisseria gonorrhoeae
2. Treponema pallidum
3. Chlamydia trachomatis (non-gonococcal urethritis)
4. Ureaplasma urealyticum (non-gonococcal urethritis)

Gastritis

• H. pylori

Peptic Ulcer

• H. pylori