Focetria should not be given to patients who have had an anaphylactic reaction (severe allergic reaction) to any of the components of the vaccine, or to any substances found at trace levels in the vaccine, such as eggs, chicken protein, kanamycin or neomycin sulphate (two antibiotics), formaldehyde, cetyltrimethylammonium bromide (CTAB) and polysorbate 80.