There is no regular ocean communication. A valid passport and visa are required. Visas are available through the embassy of Senegal in Washington. Visas also may be obtained on arrival if unavailable in country of origin. No vaccinations are required.
Malaria is widespread, and prophylactics, such as chloroquine, paludrine, and fansidar, are used.
Take reasonable precautions in eating fruits, vegetables, and meats. Seek advice before using beaches. The country is 8 time zones earlier than Eastern Standard time. There are flights to and from Comoros from Paris, Mauritius, Nairobi, South Africa, Tanzania, and Madagascar. The three main islands are connected by daily flights, but there is no regular ocean communication.