Final answer:
Some vaccines may be contraindicated for individuals with severe egg allergies, while others may contain trace amounts of shellfish proteins that can trigger allergic reactions in individuals with severe shellfish allergies. Peanut allergies are not contraindicated for vaccines.
Step-by-step explanation:
The life-threatening allergies that are contraindicated for some vaccines include:
- Eggs: Some vaccines, such as the flu vaccine, are made using eggs. People with severe egg allergies may have an allergic reaction to the vaccine.
- Shellfish: Shellfish allergies are not contraindicated for vaccines. However, some vaccines may contain trace amounts of shellfish proteins, which can cause an allergic reaction in individuals with severe shellfish allergies.
- Peanuts: Peanuts are not used in the production of vaccines, so peanut allergies are not contraindicated for vaccines.