Where does yellow fever occur and how many people are affected?
The virus is permanently prevalent, with a more or less constant number of sufferers (ie it is endemic) in several tropical regions of Africa and on the continent of America. In addition, there is an increasing number of epidemics, in which a large number of people suddenly develop yellow fever. Every year about 200,000 cases of yellow fever are recorded, and 30,000 of these die, but the figures are underestimated because of poor record-keeping. In total, yellow fever occurs in 33 countries and 468 million people are at risk of catching the disease. As yet there is no yellow fever in Asia, but it is feared that the high level of international travel could introduce the virus by means of infected people. Mosquitoes do live here, and they could potentially transmit the disease and create a new reservoir. Consequently, the countries of Asia have very strict quarantine regulations, which apply if you arrive without a valid vaccination certificate travelling from areas in Africa and Latin A
