Which of the following is true of pathogens?
a. pathogens cause noninfectious diseases.
b. pathogens are not spread from person to person.
c. pathogens are larger organisms such as plants and animals.
d. pathogens can be found in saliva and mucus drops from sneezes.

Joe has been suffering from asthma since childhood. recently, a severe asthma attack struck, after which he has been finding it difficult to breathe normally. what can ease his condition?

[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 type of medicine to people take if they are lactose intolerance