Which is a true statement about vaccines?

a.
vaccines can protect against the spread of specific diseases.

b.
vaccines cause the nervous system to destroy specific germs.

c.
vaccines usually increase the spread of specific diseases.

d.
all of the above

When you have proper posture, your back is arched. a. true b. false

Jessica is a friend dislodge a piece of meat from her throat. she delivers five blows on her friend’s back with her fist and then gives him five abdominal thrusts. is jessica doing the procedure correctly? 1 no, she should use the heel of her hand for the blows. 2 no, she should use the side of her hand for the blows. 3 no, she should use her elbows to deliver the blows. 4 no, she should use a tennis ball to deliver the blows.

Which of the following statements best describes an opportunistic infection (ol)? a. ols are common only to people with healthy immune systems b. ols are more frequent in the earlier stages of hiv c. ols are the common cause of death of people with hiv/aids d. ols can be deadly to perfectly healthy people.