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Bacteria, Fungi and Viruses, Sizes and Significance

Organism

Microbial Group

Rod Length µm

Rod or Coccus Diameter µm

Source

Significance

 

 

 

 

 

 

Absidia corymbifera

Fungi

 

3.8

Environmental

Zygomycosis

Acetobacter Melanogenus

Bacteria

1.0-2.0

0.4-0.8

 

Strong beer/vinegar bacterium.

Acinetobacter

Bacteria

 

1.3

Environmental

Opportunistic infections

Acremonium spp.

Fungi

 

2.5

Environmental

Extrinsic Allergic Aveons

Actinomyces israelii

Bacteria

 

1.0

Humans

Antinomycosis

Adenovirus

Virus

 

0.08

Humans

Colds

Alcaligenes Viscolactis

Bacteria

0.8-2.6

0.6-1.0

 

Causes ropiness in milk.

Alkaligenes

Bacteria                

 

0.75

Humans

Opportunistic infections

Alternaria alternata

Fungi

 

14.4

Environmental

Mycotoxicosis

Arenavirus

Virus

 

0.18

Rodents

Hemorrhagic fever

Aspergillis spp.

Fungi

 

3.5

Environmental

Aspergillosis, Volatile Organic Compound

Aureobasidium pullulans

Fungi

 

5

Environmental

Chromomycosis

Bacillus anthracis

Bacteria

3.0-10.0

1.0-1.3

(1.1 average)

Environmental

Causes anthrax in mammals

Bacillus Stearothermophilus

Bacteria

2.0-5.0

0.6-1.0

 

Biological indicator for steam sterilization

Bacillus subtilis

Bacteria

2.0-3.0

0.7-0.8

 

Biological indicator for ethylene oxide sterilization

Blastomyces dermatiitidis

Fungi

 

14

Environmental

Blastomycosis

Bordetella pertussis

Bacteria

 

0.25

Humans

Whooping cough

Botrytis cinera

Fungi

 

7

Environmental

Extrinsic Allergic Aveons

Cardiobacterium

Bacteria                

 

0.63

Humans

Opportunistic infections

Chaetomium globosum

Fungi

 

5.5

Environmental

Chromomycosis, Volatile Organic Compound

Chiamydia psittaci

Bacteria

 

0.3

Birds

Psittacosis

Chlamydia pneumoiae

Virus

 

0.3

Humans

Pneumonia

Cladosporium spp.

Fungi

 

9

Environmental

Chromblastomycosis

Clostridium botulinum (B)

Bacteria                

3.0-8.0

0.5-0.8

 

Produces exotin causes botulism

Clostridium Perinngens

Bacteria

4.0-8.0

1.0-1.5

 

Produces toxin causing food poisoning

Clostridium tetani

Bacteria                

4.0-8.0

0.4-0.6

 

Produces exotoxin causing tetanus

Coccidioides immitis

Fungi     

 

4

Environmental

Coccidiodomycosis

Coronavirus

Virus

 

0.11

Humans

Colds

Corynebacteria diphtheria

Bacteria                

 

1.0

Humans

Diphtheria

Coxiella burnetii

Bacteria

 

0.5

Cattle, sheep

Q fever

Coxsackievirus

Virus

 

0.027

Humans

Colds

Cryptococcus neoformans

Fungi

 

5.5

Environmental

Cryptococcosis

Diplococcus Pneumoniae

Bacteria                

 

0.5-1.25

 

Causes lobar pneumonia

Echovirus

Virus

 

0.028

Humans

Colds

Emericella nidulans

Fungi

 

3.3

Environmental

Mycotoxicosis, Volatile Organic Compound

Epicoccum nigrum

Fungi

 

20

Environmental

Extrinsic Allergic Aveons

Erwina aroideae

Bacteria                

2.0-3.0

0.5

 

Causes soft rot in vegetables.

Escherichia coll  

Bacteria                

1.0-3.0

0.5

 

Indicator of fecal contamination in water.

Eurotium spp.

Fungi

 

5.8

Environmental

Extrinsic Allergic Aveons

Exophiala jeanselmei

Fungi

 

2

Environmental

Chromomycosis

Francisella tularensis

Bacteria                

 

0.2

Wild animals

Tularemia

Geomyces pannorum

Fungi

 

3

Environmental

Extrinsic Allergic Aveons

Haemophilus influenzae

Bacteria                

0.5-2.0

0.2-0.3

 

Causes influenza and acute respiratory infections

Haemophilus influenzae

Bacteria                

 

0.43

Humans

Meningitis, pneumonia

Haemophilus parainfluenzae

Bacteria

 

1

Humans

Opportunistic infections

Hantavirus

Virus

 

0.07

Rodents

Hantavirus

Helminthosporium

Fungi     

 

12.5

Environmental

Extrinsic Allergic Aveons

Histoplasma capsulatum

Fungi

 

3

Environmental

Histoplasmosis

Influenza

Virus

 

0.1

Humans, birds

Flu

Klebsielia pneumoniae

Bacteria                

5

0.4-0.5

Environmental

Opportunistic infections, causes pneumonia and other respiratory inflammation

Lactobacillus Delbrueckil

Bacteria                

2.0-9.0

0.5-0.8

 

Causes souring of grain-mashes

Legionella pneumophia

Bacteria                

 

0.6

Environmental

Pontiac fever

Micromonospora faeni

Actinomycetes

 

1

Agricultural

Farmers’ lung, Hypersensitivity Pneumonitis

Micropolyspora faeni

Actinomycetes

 

0.69

Agricultural

Farmers’ lung, Hypersensitivity Pneumonitis

Moraxella catarrhalis

Bacteria                

 

1.3

Humans

Opportunistic infections

Moraxella lacunata

Bacteria

 

1

Humans

Opportunistic infections

Morbillvirus

Virus