The basic reproductive ratio for an infection was estimated to be 2.3. Which of the following BEST describes the meaning of this estimate?Select one alternative:The probability of contact with an infected individual is 2.3 higher compared to other diseases.The effective contact rate for the infection is 2.3 greater than to other infections.The infection on average is caused by 2.3 infected individuals in a population.An average infectious individual gives rise on average to 2.3 infected individuals.

Which of the following is NOT included in the estimation of the effective contact rate (ECR) for an infectious pathogen?Select one alternative:A) Population at riskB) Contact rateC) Probability of contact with infectious individualsD) Both A and C

If the mean age of infection with a pathogen is 8 years in a population with mean life expectancy of 80 years, what is the approximate R0 for the pathogen?1 point

Which of the following correctly describes infectious dose-50 (ID50)?ANSWERThe more infectious the pathogen is, the higher the ID50.The lethality of an infectious agent is usually expressed as mortality rate, rather than as ID50.The more infectious the pathogen is, the lower the ID50.ID50 describes the amount of toxin needed to kill 50 percent of affected hosts that are not treated.

For an infection to occur, how many conditions must be present? Input the correct answer in numeric form into the space provided.

The number of people infected by disease grows at a rate of 4% per week Which is true?Group of answer choicesThis is a variable rate of growth.No conclusion on the rate of growth can be made.This is a constant rate of growth.This is neither a constant nor variable rate of growth.