A patient may be considered to be inadequately vaccinated against influenza if s/he will have a significant risk of exposure to influenza and at least one of the following conditions:
(1) The patient was unable to be vaccinated because of:
(1a) a medical contraindication
(1b) lack of available vaccine
(1c) refusal of vaccine (not listed in original table)
(2) Protective immunity has not had a chance to develop, with exposure only a few days (less than 14 days) after vaccination.
(3) The vaccine may not be protective because:
(3a) the person will be exposed to a strain not covered in the current vaccine
(3b) the patient will have a significant exposure to avian influenza
(3c) the patient will have exposure to a pandemic strain of influenza (a pandemic strain occurs after an antigenic shift and would not be covered by a vaccine, as in 3a)
An inadequately vaccinated patient who is at risk for exposure to influenza should be considered for chemoprophylaxis with oseltamivir or other agent.
