A community nutritionist needs to collect data on food intake from clients. Which of the following would he use to obtain an estimate of typical food intakes of a small number of people? A) Food diary B) Food frequency questionnaire C) 24-hour recall D) Usual intake record E) Food frequency questionnaire and 24-hour recall

Nina has the flu and a high fever. her immune system is exhibiting the line of defense. this defense is part of immunity.

[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.

per vehicle mile, motorcyclists are times more likely to die in a crash than passenger car occupants.