My husband and I are flying from the US to La Paz, Bolivia, next month. Does anyone know if the US citizens are required to show the yellow fever vaccine certificate upon arriving in La Paz? The travel clinic doctor has assured me that the vaccine is not required but the online sources are somewhat inconclusive... Has anyone from the US entered Bolivia at the La Paz airport recently? Also, can you confirm that it is possible to obtain the visa at the airport upon entry? Thanks!