a. Explain why babies with agammaglobulinemia do not developopportunistic infections until about 6 months after birth.b. Explain why people with B-cell deficiencies can benefit fromartificial passive immunotherapy. Explain whether vaccinationwould work for them.c. Explain why T-cell deficiencies usually cause more severe effectsthan B-cell deficiencies.

Explain why IgM has a stronger power of agglutination than antibodies of any other class.

Explain natural/acquired immunity and active/passive immunity 4.3 Explain the basis of immunisation and evaluate its efficacy in a range of contexts 4.4 Explain essential differences between humoral and cellular responses as shown by B-lymphocytes and T-lymphocytes Case study 3: Many epidemiological studies showed that breastfed babies get sick less compared to babies who are partially breastfed or not breastfed at all. For example, researchers found that babies who are exclusively breastfed have fewer and less severe infections e.g., they have lower risk of ear, respiratory and gastrointestinal tract infections. Explain these study findings.

III blood piasma and the chiếf antibody release during secondary responses 7. binds to the surface of mass cells and mediates an allergic response 8. predominant antibody found in mucus saliva and tears IgE IgA Match the following diseases and disorders to the correct definition. A. Allergy/Hypersensitivity B. Autoimmune Disease C. Immunodeficiency 1. AIDS & SCID 2. the immune system mounts an extraordinarily vigorous response to an otherwise harmless antigen 3. a hypersensitivity reaction 4. occurs when the production or activity of immune cells or complement is B abnormal 5. the body's own immune system produces the disorder; a breakdown of self tolerance 6. affected individuals unable to combat infections that would present no problems for normally healthy people 7. multiple sclerosis and rheumatic fever 8. a fever and contact dermatitis 9. Typical Symptoms of the acute response: tearing, runny nose, and itching skin

A positive tuberculin skin test is an example ofa. a delayed-type allergy b. autoimmunity c. acute contact dermatitis d. eczema