Yellow fever vaccine is safe and effective, it successfully produced since the mid-20th century, some countries require travelers must be vaccinated before entering the country. Because the disease has no specific remedy, it is necessary to provide for those in risk areas to have access to the vaccine widely available to reduce the number of mosquitoes and reduce mosquito bites. In the 1980s, the number of cases of yellow fever began to rise again. It is in the incidence of disease recurrence (re-emerging disease) is believed to be the result of social conditions and war in many ways. African countries
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