Memórias do Instituto Oswaldo Cruz (ISSN: 1678-8060) Vol 95 Num s1
With the infestation by Aedes aegypti, urban yellow fever might already
exist. This did not occur because of either the lacking of a sufficient
contact between the diseased individual and the A. aegypti or perhaps
because this, after sixty years without transmitting the virus, needs
an adaptation phase to infecting again.