Classification of bacteria
Remember:
- Gram-positive cocci = staphylococci
Staphylococci - Gram-positive cocci
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Importance: 1
+ streptococciStreptococci - Gram-positive cocci
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Importance: 1
(including enterococciEnterococci - Gram-positive cocci
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Importance: 47
) - Gram-negative cocci = Neisseria meningitidis
Neisseria meningitidis - Gram-negative cocci
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Importance: 2
+ Neisseria gonorrhoeaeNeisseria gonorrhoeae - Gram-negative cocci
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Importance: 17
, also Moraxella catarrhalisMoraxella catarrhalis - Gram-negative cocci
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Importance: 45
Therefore, only a small list of Gram-positive rods (bacilli) need to be memorised to categorise all bacteria - mnemonic = ABCD L
- Actinomyces
Actinomyces - Gram-positive rod
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Importance: 28
- Bacillus anthracis
Bacillus anthracis - Gram-positive rod
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Importance: 51
(anthrax) - Clostridium
Clostridium - Gram-positive rod
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Importance: 54
- Diphtheria: Corynebacterium diphtheriae
Corynebacterium diphtheriae - Gram-positive rod
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Importance: 8
- Listeria monocytogenes
Listeria monocytogenes - Gram-positive rod
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Importance: 44
Remaining organisms are Gram-negative rods, e.g.:
- Escherichia coli
E. coli is an aerobic gram-negative rod
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Importance: 6
- Haemophilus influenzae
Haemophilus influenzae - Gram-negative rod
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Importance: 31
- Pseudomonas aeruginosa
Pseudomonas aeruginosa - Gram-negative rod
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Importance: 24
- Salmonella sp.
Salmonella sp. - Gram-negative rod
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Importance: 29
- Shigella sp.
Shigella sp. - Gram-negative rod
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Importance: 19
- Campylobacter jejuni
Campylobacter jejuni - Gram-negative rod
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Importance: 22
+PassMedicine Notes
Remember:
- Gram-positive cocci = staphylococci + streptococci (including enterococci)
- Gram-negative cocci = Neisseria meningitidis + Neisseria gonorrhoeae, also Moraxella catarrhalis
Therefore, only a small list of Gram-positive rods (bacilli) need to be memorised to categorise all bacteria - mnemonic = ABCD L
- Actinomyces
- Bacillus anthracis (anthrax)
- Clostridium
- Diphtheria: Corynebacterium diphtheriae
- Listeria monocytogenes
Remaining organisms are Gram-negative rods, e.g.:
- Escherichia coli
- Haemophilus influenzae
- Pseudomonas aeruginosa
- Salmonella sp.
- Shigella sp.
- Campylobacter jejuni
