Analysis of a human disease for which a vaccine has been developed indicates an R0 of 4. What would be the estimated threshold immunity required to achieve eradication or elimination where vaccination is the principle method of control, and there is no pre-existing immunity?Question 4Select one:a.90%b.75%c.25%d.50%

Which of the following is a correct statement about herd immunity?ANSWERHighly infectious pathogens that have an airborne transmission require a lower vaccination rate.Even if a community’s herd immunity dips below certain thresholds, outbreaks are unlikely.Most pathogens that we routinely vaccinate against require that at least 95 percent of the total population is immune in order to have effective herd immunity.The percentage of a population that must be vaccinated for herd immunity to be effective varies based on the pathogen.

Which of the following diseases was eradicated after a successful vaccination program?ANSWERInfluenzaMeaslesPolioSmallpox

Recall the percentage of people in a population that need to be vaccinated in order to achieve herd immunity.

A vaccine is effective because ________.Group of answer choicesthe secondary response of the adaptive immunity is faster and more efficient than the primary responsethe vaccine contains the lymphocytes necessary to fight infectionthe vaccine contains the antibodies necessary to fight infectionB-lymphocytes are unable to mount an immune response the first time they are exposed to a new pathogen

A novel microbe causing encephalitis emerges in humans with properties including:(i) R0 of 2,(ii) a single serotype,(iii) maintenance in bats and human primates,(iv) asymptomatic infection in > 60% of cases.If a vaccine was to be developed, which of these characteristics would argue in favour of potential eradication?Question 10Answera.i, iib.i, iiic.ii, iiid.ii, iv