<p>Cholera vaccine should not be administered to subjects with either known hypersensitivity to any component of vaccine, or having shown signs of hypersensitivity after previous administration of the vaccine. Formaldehyde is used during the manufacturing process and trace amounts may be present in the final product. Caution should be taken in subjects with known hypersensitivity to formaldehyde. CVV V.N. 02 TM As with other vaccines, immunization with the cholera vaccine should be delayed in the presence of any acute illness, including acute gastrointestinal illness or acute febrile illness. A minor illness such as mild upper respiratory tract infection is not a reason to postpone immunization.</p>