A nurse becomes infected when she breathes in the bacteria that cause the disease tuberculosis. As she starts to cough and releases some of that bacteria. Examine the diagram below that shows the
regarding this nurse.
Chain of Infection
Portal of entry
D
Host A
Transmission
c
Portal of exit
с
Infectious B
agent
Reservoir
What do the labels A, B, C, and D represent in the case of this nurse?

Explain why you would or would not have a lasik surgery if you wore contacts or glasses.describe how public opinions related to this surgery have changed over the years.in your own words, explain this surgery as though you are explaining it to someone who has no knowledge of the procedure.

[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.

Stasis of blood flow from immobility injury to a vessel or predisposition to clot formation increase the risk of