Some infected persons do not appear to be sick, but they can still spread the germ to others. If you are traveling to plague-infected areas of Africa, Asia, Latin America, or the western third of the United States, plague vaccine may help prevent plague infection. Therefore, it is very important to avoid contact with domestic and wild animals that may be infected, even if you have received the vaccine. To reduce your chance of getting plague from the bites of infected fleas, use insect repellent on exposed parts of your body, such as legs and ankles. Also apply DEET or another insecticide to clothes and outer bedding according to manufacturers' directions.
Plague vaccine is to be administered only by or under the supervision of a doctor.
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. Also tell your health care professional if you are allergic to any other substances, such as foods, preservatives, or dyes. Studies on the effects of plague vaccine in pregnancy have not been done in either humans or animals. This vaccine has not been reported to cause problems in nursing babies.