False.
There is no universal vaccine that is recommended for all people traveling to a developing country. The specific vaccines that are recommended depend on the particular destination, the traveler's health status and medical history, and other factors such as the duration and purpose of travel. Some vaccines, such as those for yellow fever or meningococcal disease, may be required for entry into certain countries. It is important for travelers to consult with a healthcare provider or travel medicine specialist well in advance of travel to determine the appropriate vaccines and other preventive measures needed for their specific itinerary.