Two directly transmitted viral diseases have the same critical immunization threshold
(P) even though their effects on the host are different. Which of the following differences
between the two diseases could lead to the same critical immunization threshold?
oOne disease has a higher transmission rato and a longer recovery period than the other
One disease has a lower transmission rate and a longer recovery period than the other
O One disease has a lower transmission rate and a shorter recovery period than the other.
o For one disease, the recovery period is long: for the other, no one recovers
Answers
Answer:
Immunoprophylaxis
Immunoprophylaxis against viral illnesses includes the use of vaccines or antibody-containing preparations to provide immune protection against a specific disease.
Active Prophylaxis (Vaccines)
Active immunization involves administering a virus preparation that stimulates the body's immune system to produce its own specific immunity. Viral vaccines now available for use include the following types: (1) attenuated live viruses; (2) killed viruses; (3) recombinant produced antigens. A vaccinee is a person who has been vaccinated.
Immune Response to Vaccines: Vaccination evokes an antibody response and stimulates T lymphocytes. Vaccine effectiveness is assessed in terms of percentage of recipients protected and the duration and degree of protection. Most effective viral vaccines protect more than 90 percent of recipients and produce fairly durable immunity.