“Any foreign person, not resident in Paraguay, coming from a risk area, must present the international certificate of vaccination against yellow fever to enter Paraguay,” the authorities ...

The vaccination certificate is necessary to enter and leave Paraguay. The World Health Organization (WHO) has established that a single dose of yellow fever vaccine provides lifelong immunity.

In the 20th century, a vaccine for yellow fever was developed to protect people in regions where the disease still flourishes. Epidemics continued, however, during every decade of the century ...