We started reading the CDC(Center for disease control & Prevention ) before we were planning to go to the international travelling.
Every country has different requirements and vaccines.
Some of the vaccines we never got in the USA.
We took our family doctor, paediatrician appointment. They recommend us to talk with travel doctor too.
We took travel doctor appointment. The travel doctor gave us some particular immunization and some medicines and advise.
What we need for travelling.
Some countries need immunization before anybody enter.
We learned several new things.
Typhoid vaccine is important for travelling, we never had.
Our doctor ordered those vaccines for us and we paid.
It is not covered with the regular immunization in the USA.
What is your opinion about this? What kind of precaution you take before travelling.

https://www.cdc.gov/vaccines/vpd/vaccines-list.html

https://kidshealth.org/en/parents/immunization-chart.html

http://www.who.int/immunization/diseases/en/

https://en.wikipedia.org/wiki/List_of_vaccine_topics