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HEALTH MICROBIOLOGY

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(1)

BIO 431

HEALTH MICROBIOLOGY

(2)

Viruses and Respiratory Infections

• The proliferation of viruses is completely dependent on the host cell.

• Selective effective drug development is difficult.

(3)

Viruses and Respiratory Infections

• Infectious diseases in developed countries are often viral.

• Effective vaccines are available for flowers and rabies.

• Viral diseases are transmitted by airborne virus-infected droplets.

(4)

Viruses and Respiratory Infections

• Measles (measeles), mumps (mumps), rubella (rubella), chickenpox (varicella = chickenbox), colds (cold), influenza (flu) and SARS will be mentioned.

(5)

Comparison of Colds and Flu

(6)

Flu (Influenza)

• Reorganization of RNA fragments is called antigenic shift, which changes the hemionglutinin (HA or H) and neuraminidase (NA or N), the two important proteins involved in the virion protein envelope, especially the adhesion of viruses to the host cell and release from the cell at the final stage.

(7)

Flu (Influenza)

• In addition, minor antigenic changes occur with point mutations that result in the exchange of one or more amino acids. This phenomenon is called antigenic drift.

(8)

Flu (Influenza)

• The flu virus is transmitted by air, especially through droplets that scatter during coughing and sneezing (sneezing).

• The virus infects the upper respiratory tract mucous membranes, rarely invading the lungs.

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