How do researchers identify the specific cause of an infectious disease? List the four steps. (4 points)

Question

How do researchers identify the specific cause of an infectious disease? List the four steps.  (4 points)

anonymous · Answer

#1S-CRP to determine whether it's a virus or bacteria, (viruses usually has a spiking value up to several thousands, while bacteria is around 15-200.)

#2 (bacteria) Fecal/urinary sample if bacteria to determine exactally which type of bacteria. 
#2 (Viruses) Compare symptoms to known viruses and perform bloodwork to confirm diagnoses on viruses matching the diagnosis. It would probably be safest to administrate either Interferon or a broadspectrum interfron (Cycloferon). 

I shortened it down to two steps, do i get bonus points?