Can u contract hiv by going to a barbershop if they don't clean their instruments after every use

[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.

This is a negative reaction to food that doesn’t involve the immune system

What would someone with good self-esteem do? a. learn from mistakes. b. reject constructive feedback. c. focus in weeknesses rather than strengths. d. strive for the perfect body.