[Overview of emerging and re-emerging infections -the historical transition of infectious diseases-].

It is presumed that various changes of rapid increase of the human and material traffic with worldwide scale, environment, or a social situation have caused the infection showing emerging and re-emerging infectious diseases. These infectious diseases as the emerging infectious diseases which were not seen until now and the re-emerging infectious diseases which have observed again have been increased. Emerging and re-emerging infections hap- pened by various factors, such as environmental destruction by the increase in a traveler or export and import, and a deforestation. Nowadays,we face to AIDS, Lassa fever, Ebola dis- ease, highly pathogenic avian influenza, haemorrhagic fever with renal syndrome, tuberculo- sis, enterohemorrhagic E. coli infection, Legionella infection, the Cryptosporidium infection, Zika virus infection, etc. are mentioned.