Biotypes of Corynebacterium Diphtheriae

Biotypes of Corynebacterium diphtheriae

Corynebacterium diphtheriae is a nonmotile, noncapsulated, club-shaped, gram-positive bacillus. Toxigenic strains are lysogenic for one of a family of corynebacteriophages that carry the structural gene for diphtheria toxin, tox. Corynebacterium diphtheriae is classified into biotypes (mitis, intermedius, and gravis) according to colony morphology, as well as into lysotypes based upon corynebacteriophage sensitivity. McLeod and Anderson …

Read moreBiotypes of Corynebacterium Diphtheriae

Difference between O Antigen and H Antigen

Difference between O Antigen and H Antigen

The antigen used to define serological test of Salmonella include Somatic O antigen, Flagellar H antigen and Vi antigen (Capsular antigen). Some of the differences between O Antigen and H Antigen are as follows: S.N. Characteristics O Antigen H Antigen 1. Types Somatic Antigen Flagellar antigen 2. Composition Polysaccharide Proteinaceous 3. Antibody formation Rapid and …

Read moreDifference between O Antigen and H Antigen

Difference between S. pneumoniae and Viridans Streptococci

Difference between S. pneumoniae and Viridans Streptococci

S.N. Characteristics S. pneumoniae Viridans Streptococci 1. Morphology Lanceolate diplococci Oval or round cells in chain 2. Capsule Capsulated Non-capsulated 3. Quellung Test Positive Negative 4. Bile solubility Bile soluble Bile insoluble 5. Inulin fermentation Positive Negative 6. Optochin sensitivity Sensitive Resistant 7. Pathogenicity in mice Pathogenic Non-pathogenic 8. Hemolysis Alpha-hemolytic (under aerobic conditions) or …

Read moreDifference between S. pneumoniae and Viridans Streptococci

Difference between Innate and Adaptive Immunity

Difference between Innate and Adaptive Immunity

S.N. Characteristics Innate Immunity Adaptive immunity 1. Presence Innate immunity is something already present in the body. Adaptive immunity is created in response to exposure to a foreign substance. 2. Specificity Non-Specific Specific 3. Response Fights any foreign invader Fight only specific infection 4. Response Rapid Slow (1-2 weeks) 5. Potency Limited and Lower potency …

Read moreDifference between Innate and Adaptive Immunity

Difference between Replication and Transcription

Difference between Replication and Transcription

S.N. Characteristics Replication Transcription 1. Definition DNA replication is the process of making two daughter strand where each daughter strand contains half of the original DNA double helix. Transcription is the process of synthesis of RNA using DNA as a template. 2. Purpose To conserve the entire genome for next generation. To make RNA copies …

Read moreDifference between Replication and Transcription

Difference between Anthrax Bacilli and Anthracoid Bacilli

Difference between Anthrax Bacilli and Anthracoid Bacilli

S.N. Characteristics Anthrax Bacilli Anthracoid Bacilli 1. Motility Non-Motile Generally Motile 2. Capsule Capsulated Non-Capsulated 3. Shape Grow in long chains Grow in short chains 4. Medusa Head Colony Present Not Present 5. Growth in Penicillin Agar (10 units/ml) No Growth Grow Usually 6. Hemolysis Hemolysis absent or weak. Usually well marked 7. Gelatin Liquefaction …

Read moreDifference between Anthrax Bacilli and Anthracoid Bacilli

Difference between Neisseria gonorrhoeae and Neisseria meningitidis

Difference between Neisseria gonorrhoeae and Neisseria meningitides

Neisseria gonorrhoeae and Neisseria meningitidis are both Gram Negative Bacteria. They are diplococci, non-sporing, non-motile and oxidase positive. But they have some differences which are as follows: S.N. Characteristics Neisseria gonorrhoeae Neisseria meningitidis 1 Referred as Referred to as gonococcus. Referred to as meningococcus. 2 Agents N. gonorrhoeae is the agent of gonorrhoea. N. meningitidis …

Read moreDifference between Neisseria gonorrhoeae and Neisseria meningitidis

Difference Between Meningitis and Encephalitis

Difference Between Meningitis and Encephalitis

Meningitis and encephalitis may be the most terrifying diseases in medicine. Bacterial meningitis and viral encephalitis may be rapidly fatal, even in healthy persons. Survivors may suffer lasting neurological sequelae, including memory loss and seizures. Viral meningitis, by contrast, gives patients a bad headache and a stiff neck, but uneventful recovery is the rule. Some …

Read moreDifference Between Meningitis and Encephalitis

Differences Between Staphylococcus and Streptococcus

Differences Between Staphylococcus and Streptococcus

Staphylococcus and Streptococcus are both Gram positive organisms and cocci in shape. They are Non-motile, Non-Sporing and Facultative anaerobes. But they possess some of the differences which are as follows: S.N Characteristics Staphylococcus Streptococcus 1 Arrangement Grape-like clusters. A chain of round cells. 2 Division Staphylococci divide in various directions (multiple axes). Division occurs in one linear direction (single …

Read moreDifferences Between Staphylococcus and Streptococcus

Differences Between Chickenpox and Smallpox

Differences Between Chickenpox and Smallpox

S.N Characteristics Chickenpox Smallpox 1 Causative Agent Varicella Zoster Virus (Herpes Virus) Variola virus (Pox Virus) 2 Incubation period 14-21 days 7-17 days 3 Severity Chickenpox is less deadly comparing to small pox. Smallpox is deadly severe comparing to chicken pox. 4 Lesions Lesions first appear on the face or trunk. Lesions first appear in …

Read moreDifferences Between Chickenpox and Smallpox

Differences Between Antigenic Shift and Antigenic Drift

Antigenic Shift and Antigenic Drift

Influenza Virus are remarkable because of the frequent antigenic change that occurs in HA (hemagglutinin) or NA (neuraminidase). The two surface antigens of influenza undergo antigenic variation independent of each other. They are Antigenic Shift and Antigenic Drift. Some of the Differences Between Antigenic Shift and Antigenic Drift are as follows: S.N. Antigenic Shift Antigenic …

Read moreDifferences Between Antigenic Shift and Antigenic Drift

Differences Between Bacteria and Viruses

Differences Between Bacteria and Viruses

Although bacteria and viruses both are very small to be seen without a microscope, there are many differences between Bacteria and Viruses. Some of the Differences Between Bacteria and Viruses are as follows: S.N. Characteristics Bacteria Viruses 1 Size Larger (1000 nm) Smaller (20-400 nm) 2 Cell Wall Peptidoglycan or Lipopolysaccharide No cell wall. Protein …

Read moreDifferences Between Bacteria and Viruses