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“If the person has been in Khartoum for any length of time and if he has been in contact with mosquitoes, then, whether he’s been treated or not, there still is the possibility that transmission will occur,” he said. People who have yellow fever can infect mosquitoes which bite them in the early stages of the disease because they have high levels of the virus in their blood, he said. This is how viruses travel from one country to another.