Control of viral diseases

Question 1

How is viral diseases controlled

Answer 1

Prevention of transmission
   Public health surveillance
   Education
   Isolation of cases of diseases
   Passive immunization
   Active immunization- either live attenuated, inactivated, or subunit vaccines are used.

Question 2

Where is most viral vaccines prepared?

Answer 2

in tissue culture

Question 3

What is required to eliminate a virus?

Answer 3

No animal reservoir

Good vaccine

Few or no subclinical cases (latent infections ensure that the virus will survive in the population)

One antigenic type or only a few (no antigenic switching)

Question 4

how do new viral diseases arise?

Answer 4

these are usually pre-existing viruses accidentally transmitted from other species as zoonoses.

Question 5

What are contributing factors for the rising of new viral diseases?

Answer 5

Political/Social/Environmental changes that increase human contact with an infected carrier or vector (HIV).
Genetic changes
   point mutations (Influenza, HIV)
   Intramolecular recombination
  Genetic reassortment (Influenza)