Every pathogen either virus or bacteria has its own specific DNA and DNA sequencing recognizes similarities while study sequence of nucleotide.
Further explanation
DNA sequencing
It is a phenomenon in which a piece of DNA is taken and its nucleotide bases (guanine, adenine, thymine and cytosine) are determined. It is useful to study genetic information of an organism. Earlier technique of RNA sequencing was used.
Invention of DNA sequencing
Frederick Sanger was the first person who used this technique and was invented in 1970s. This technique is used in various field of biology such as molecular biology, Medicine, evolutionary biology, biotechnology and forensics.
Advantages of DNA sequencing
	It provides accurate information  
	Genome remains same throughout life so it is done once in life
	It is not an expensive method so we can say that it saves money
	Genomic information can be obtained which is required for various purposes as health care
	Identify defective genes
Disadvantages of DNA sequencing
	It is a very time taking technique
	It cannot detect translocation, deletion and insertion 
Answer details
Subject: Biology
Level: High school
Key words
	DNA sequencing
	Invention of DNA sequencing
	Advantages of DNA sequencing
	Disadvantages of DNA sequencing
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