Nature defences against viral infections, Biology

Nature defences against viral infections

1.      Interferons - In 1957 Issue and Lindenmann discovered that vertebrate cells infected with viruses, produce a diffusible antiviral protein which they named interferon. Later interferon's were found to be a class ofglyco0proteins.Interferon diffuses put from an infected cell, enters into similar cells enters into similar cells in the neighbourhood .and imparts a defense   mechanism to these cells against viral infection. It has no action upon proteins in the infected cells. it is therefore used for therapeutic and  preventive purposes in viral infections

2.      Body immunity -Viruses are effectively poisonous these are good antigens to induce active production of specific antibodies and immune reaction in the body .Thus viral infection  establish prolonged and effective immunity in the body against reinfection by the respective viruses.

Immunoprophylaxis - Vaccines

Vaccines have been extensively used to build a strong and prolonged anti viral immunity in the body against possible viral infections. The vaccines contain inactivated virions themselves which cannot cause the concerned diseases, but still act as antigens to induce antibody production by the immune system of body.

Chemotherapy- Antiviral drugs

Since viruses are strictly  intracellular parasites  chemotherapeutic agents and antibiotics which help in the treatment and control   of bacterial diseases are ineffective for viral diseases. Central antiviral drugs have however been prepared since 1960.Some   important antiviral drugs are Thsosemicarbazone  for treatment and prevention of smallpox Ribavirin for influenza Deoxyuridines for herpes foscarnet for  hepatitis B,etc. 

Posted Date: 9/26/2012 6:11:41 AM | Location : United States







Related Discussions:- Nature defences against viral infections, Assignment Help, Ask Question on Nature defences against viral infections, Get Answer, Expert's Help, Nature defences against viral infections Discussions

Write discussion on Nature defences against viral infections
Your posts are moderated
Related Questions
Phases of viruses Viruses have two phases to their existence Inside their host cells where they exhibit certain living characteristics. outside their host where they

Human Population-Historical Overview Throughout history, the human population has been quite small. It has grown relatively slowly and even experienced occasional declines. Fi

Adverse Effects of Bronchospasm Nasal and throat discomfort can occur. Bronchospasm, sometimes severe, has been reported uncommonly in patients with reactive airway disease; za

Define Types of Indicators? Macro indicators are used at strategic levels while micro indicators are used at performance levels. From the previous sections it is clear that man

Explain Risk Factors For CAD? As has been noted, CAD is very common among the Indians and many studies have been undertaken to find out the reasons behind this predilection. Wh

PHYSIOLOG Y OF DIGESTION Food - omnivorous. Digestion - Intercellular. (i) Mechanical - by chewing, deglutinationm, churnning, peristalais. Under control of medulla oblonge

Proestrus - Estrous cycle This precedes the next heat and is characterised by functional involution of the corpora lutea and preovulatory swelling of the follicles. Fluid coll

State in brief about the Zinc    It is concerned with the functioning of sulphydryl compounds, such as cysteine, in regulation of redox potential within the cell. Zinc is somet

Is water a polar or a non-polar molecule? What is the consequence of that characteristic for the function of water as solvent? Water is made of two atoms of hydrogen attached b

Three charges are arranged as shown in the figure below. Find the magnitude and direction of the electrostatic force on the charge q = 4.78 nC at the origin. (Let r12 = 0.260 m.)