Infection and its Types in Microbiology

Infection and its Types in Microbiology


  • Infection is a condition of host in which parasite lives, multiplies in the host body.
  • Infection normally occurs when a parasite is very active and it suppresses the host defense mechanism.
  • Depending upon the nature of host, parasite and the persistence of the disease the infection is divided into following types.

1. Chronic infection

  • Chronic infection is a long lasting infection.
  • Examples :- Diabetes, Cancer, Sickle cell anemia, Autoimmune diseases etc .

2. Acute infection

  • It is a disease that spreads rapidly in short period of time.
  • Example:- Common cold, Chicken pox, Pneumonia etc.

3. Primary infection

  • It is a primary infection caused by parasite as it enters the host body.
  • Examples:- Immunodeficiency diseases, HIV/AIDS.

4. Secondary infection

  • Secondary infection is caused in a host which is already infected by primary infection.
  • The primary infection is caused by one parasite and secondary infection is caused by other parasite in the same host body.
  • Examples:- Infection like Common cold, Tuberculosis are the secondary infection caused in the patient suffering from HIV.

5. Reinfection

  • Reinfection is a infection that subsequently occur in the host by same parasite.
  • Example:- Reinfection of Tuberculosis,Common cold.

6. Congenital infection

  •  It is the infection that is transmitted from a mother to new born baby
  • Examples:- Hepitatis B, HIV, Herpes zoster.

7. Generalized infection

  • The infection in which the host is infected by one or more parasite.
  • These parasite travel from one part to other parts of a body and cause infection is called as generalized infection.
  • In generalized infection variety of signs and symptoms observed.
  • Examples:- Systemic infection like Aches, Chills,Fever,Nausea, Vomiting, and weakness.

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