An expository article is usually about explaining something or talking about it. So if it's a true story and you write it like a life story then yes it can be. If it's just a fictional story you want to write then no.
Because if you are ever doing research, for instance when you have to turn in your thesis for your PhD, you have to pass peer review. Also intellectual data that is not yours has to be properly cited otherwise it is considered academic dishonesty.
they give what comes to there mind so it might be right or wrong
If I were to read " Stop the Spread of Superbugs" I would ask " I would ask what are Superbugs and how did they start spreading in the first place?"
On the second one I would ask, "How would resisting antibiotics be a threat in 2013?", and " Was here a virus that started?"