Microbial taxonomy has been constantly readjusted following the develpoment of techniques and equipments. New clinical entities were discovered and described as “emergent infectious diseases”. Also, the epidemic dimension and clinical evolution of some communicable diseases have been marked by important changes; this led to these diseases being labeled as “reemergent”. Together with newly discovered/ re-classified microorganisms, the phenomenon of increased antibiotic resistence is generating problems all over the world.
For more details go through the link: