Because vaccines have healthy viruses that try to get your body to be immune to the diseases so when you are already sick your body won't respond to the vaccine because it's just more viruses
Answer:
Having a first-degree relative, such as a parent or sibling, with bipolar disorder. Periods of high stress, such as the death of a loved one or other traumatic event. Drug or alcohol abuse.
Explanation:
I think either A or C because B doesn't make any sense.
