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
Q. Association of Fibrinogen With Cardiovascular Risk Factors? Ans. Fibrinogen, a large glycoprotein made mostly in the liver, is a clotting factor that activates thrombin

Metaphase This  is a period  of short duration, the  chromosomes are  at the  stage of their  maximum  condensation and , hence more  clearly  visible ,Upon  each  side  of the

Explain intravascular fluid compartment - extracellular fluid? The extracellular fluid compartment is sub-divided into the intravascular fluid compartment (fluid within the blo

Subphylum Opalinata Body covered with longitudinal rows of cilium like ,organelles but true ciliature absent. Parasitic; cytosome lacking; two to many nuclei of one type.

In this 1st step, the corresponding  aminoacyl-tRNA for  the  second  codon  binds  to  the  A  site  by  codon-anticodon interaction.  Binding  of  the  aminoacyl-tRNA needs  elon

In organisms that have undergone tagmosisthe trunk often develops into two tagma, oneinvolved in locomotion and one that is notlocomotory. The tagma not involved in locomotionis re

Many patients who are weak, fearful or shot of breath find it essential to hold tightly to the handrail while walking. If accurate aerobic information is to be obtained handrail su

Explain Strengthening the public health measures? Parasitic infestations and protozoal infections cause iron deficiency through loss of blood or destruction of red blood cells.

A dihybrid cross yields 320 F2 offspring. How many are expected to resemble the homozygous recessive parental?

Preliminary treatment of implant therapy It is important to ensure a healthy oral environment before going ahead with implant procedure. The treatment needs to be initiated in