Biology

Tori

12 April, 17:38

Doctors often use certain medications to treat infections. A few people have a reaction to some of these medications, such as itching, swelling, or trouble breathing. This is an example of

1. using antibodies to cure a medical problem

2. the body's immune system overreacting to a usually harmless substance

3. the body creating a mutation to fight unknown pathogens

4. a vaccine causing the body to produce antigens against the infection