Which part of the chain of infection is defined as the carrying of a disease or infection from one person or thing to another?
o the host
O the reservoir
O the portal of entry
O the mode of transmission

[120 total points] (public health) in one of the largest human experiments ever conducted, in 1954 a randomized controlled trial was run to see whether a vaccine developed by a doctor named jonas salk was effective in preventing paralytic polio. a total of 401,974 children (ages 6–9), chosen to be representative of those who might be susceptible to the disease, were randomized to two groups: 200,745 children (the control group c) were injected with a harmless saline solution (a placebo) and the other 201,229 children (the treatment group t) were injected with salk’s vaccine.what was the point of giving saline solution to the children who didn’t get the vaccine? explain briefly.

What does fi stand for in the fitt-vp principle of exercise prescription?

Wanting to know the rules and the right person to ask for are characteristics of the safety reassurances required by preschoolers. infants. school-age children. toddlers.