1 Usually, staph bacteria donât cause any harm. 2  However,if they get inside the body they can cause an infection. 3  When common antibiotics donât kill the staph bacteria, it means the bacteria have become resistant to those antibiotics. 4  This type of staph is called MRSA (Methicillin-Resistant Staphylococcus aureus).
A genetic marker is defined as a specific gene or DNA sequence that produces a detectable trait with a known location on a chromosome and that can be used to study family and population, identification of cells, species or individual. Introduction:
Blood tests for tumor antigens/antibodies produced against tumors are called tumor marker tests. They can be used to detect first-time cancer and cancer relapses. Genetic Tests When individuals test positive for the presence of marker genes, such as the BRCA1 breast cancer oncogene, they should be vigilant for signs of cancer.