What is full form of MRSA and why are these bacteria a threat to mankind?
MRSA is genetically unique bacteria which causes infections in human which are difficult to treat due to the organisms' antibiotic resistant nature.
MRSA or Methicillin Resistant Staph Aureus contains a gene which is responsible for its resistance against Methicillin (or other similar penicillin derivatives) action, hence the drug can't kill it.
This type of resistance is obtained by transduction, a horizontal gene transfer process in which foreign genes are transferred by plasmid to a bacterial genome. First identified in 1960s, such resistant bacteria are now reported from most hospitals.