Photo: Art made by nature in Vale da Lua in Chapada dos Veadeiros / Goiás / Brazil.
Now, if you forget or lose your vaccination card, you can print it. This document is available online.
When you take the yellow fever vaccine, you can claim your digital international certificate of immunization by the governmental Service Portal (Portal de Serviços – https://www.servicos.gov.br/) Within 5 working days, the ANVISA (National Health Surveillance Agency) team analyses your process and send you an answer.
More detailed information at http://portal.anvisa.gov.br/
Warning: Before going to study, check if destination country authorities do not require proof of vaccination against yellow fever.