Microbiology Exam 3 Essay

1910 Words Aug 21st, 2014 8 Pages
Microbiology Exam 3
Amber E. Baity
Excelsior College

1.Blood isolated from an emergency room patient contains antibodies against the measles virus. Please explain whether or not the patient should be quarantined immediately because they are infected with the measles virus and why? What are the other plausible explanations for anti-measles antibodies in the patient’s blood?
Though this could appear a critical situation, this patient does not need to be quarantined, as we do not know if the antibodies present in his body are from a current infection or due to a vaccination. Measles and mumps antibodies are virus-specific proteins produced by the immune system in response to an infection by the measles or mumps virus, or in response to
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Furthermore, this population differentiates into two distinct cell types; one type, called plasma cells, acts to immediately eradicate the antigen by secreting antibodies, and another type, called memory cells, remain quiescent (inactive) until the antigen is encountered again in the future.
After recovery from an infection, there could be monitored gradual declination in the concentration of antibodies relevant with agents causing infection and after a certain period, they might not be detected in the body, still such individuals could be called “protected” against the second attack by pathogen/ disease causing agent. Even a second contact to such agent may result into quicker and larger immune response known as secondary response. The rationale behind such effective immune response against secondary infection is that it exhibits participation of a bigger number of antigen-specific cells called memory cells (B and/or T cells) than subsisted before primary response. Owing to initial clonal expansion, few progeny cells might not have divided or developed into plasma cells. As an alternative, they revert to tiny lymphocytes bearing similar specific receptor on their surface as present on their ancestors. Because of such receptors, the secondary encounter by an antigen could be identified rapidly, and may lead towards a quicker and massive response by the body against the antigen.
3. Positive diagnosis of AIDS is made when

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