Future vaccine protocols must be modified according to the vaccine component suspected to have triggered the reaction.

Patients with history of immediate hypersensitivity to vaccine components.

Anyone who has a severe allergy to any vaccine component should not get a dose.

A severe allergy to any vaccine component is also a reason not to get the vaccine.

Anyone who has a life-threatening allergy to any vaccine component should not get the vaccine.

Severe allergic reaction to a vaccine component (about 1 person in 55,000).

Preservative-free vaccines are available in case of hypersensitivity to eggs or to vaccine components.

Have ever had a severe allergic reaction to a hepatitis A vaccine or to any vaccine component.

Hepatitis B vaccination is contraindicated for persons with a history of anaphylactic allergy to yeast or any vaccine component (11).

Its early efforts involved automated methods to select for industrial microorganisms that could produce greater amounts of chemical feedstocks, antibiotics, or vaccine components.