A Patient Who Is Planning International Travel to a Developing

A patient who is planning international travel to a developing country asks the provider about vaccinations. Which is true about pretravel vaccines?

A) Country-specific guidelines are provided by individual embassies.
B) Malaria vaccine is the most important vaccine for worldwide travel.
C) Requirements should be reviewed at least 4 to 6 weeks prior to travel.
D) There are at least five required vaccines for entry into certain countries.