Exam 5 Flashcards
Intramuscular (IM) Route of Vaccine Administration
Upper thigh in infants, deltoid when muscle mass is sufficient ***Buttock should be avoided due to sciatic nerve damageand inconsistent IM deposition
- Hep A & B
- DTap/Dtap
- Hib
- Strep
- IPV
- Influenza
- Meningococcal
- HPV
Subcutaneous (SQ)Route of Vaccine Administration
Usually “pinch” the skin and inject into fatty tissue under the skin. MMR & Varicella
Pneumococcal Conjugate Vaccine (PCV) Types
23-valent pneumococcal polysaccharide (23-PS) available (>2 years) FDA licensed new 7-valent pneumococcal conjugate vaccine (PCV7) - < 2 years Prevnar 13 – a 13-valent pneumococcal conjugate vaccine (PCV13)
Pneumococcal Conjugate Vaccine (PCV):Contraindications/Precuations
- known hypersensitivity
* moderate to severe illness
Pneumococcal Conjugate Vaccine (PCV):Side Effects
- Local erythema
- Induration
- Tenderness
- Fussiness
- Low grade to moderate fever
MMR Vaccine Measles, Mumps, Rubella Administration
- Given subcutaneously
- 1st dose: 12-15 months (minimum age is 12 months)
- 2nd dose: 4-6 years (at school entry)
MMR Vaccine Measles, Mumps, Rubella Contraindications & Precuations
Contraindications:
- Anaphylaxis
- Pregnancy
- Immunodeficiency Precautions:
- Recent immune globulin administration
- History of thrombocytopenia
MMR Vaccine Measles, Mumps, Rubella Side Effects:
- Local tenderness/swelling
- Fever 7-10 days after
- Morbiliform rash
Active Immunity
Vaccination with live, live attenuated, or inactivated organisms, their components or their products to stimulate protective immunologic response
Contraindications for All Vaccines
Anaphylactic reaction to previous doses is an absolute contraindication for further doses Anaphylactic reaction to any component Moderate to severe illness with or without fever
Rotavirus Vaccine
Pentavalent Rotavirus Vaccine Adminster three primary doses at 2, 4 and 6 months ***Should not be initiated after age 12 weeks and not to be given at all after 32 weeks of age
Meningococcal Vaccine - MPSV 4
Children age 2-10 in susceptible children
- Complement deficiency
- Anatomic or functional asplenia
- Other high-risk groups
Varicella Vaccine: Administration
- live, attenuated virus
- 1st dose - 12-18 months or teens and adults with no history of natural infection
- 2nd dose – 4-6 years (new for 2007)95% seroconvert after 1 dose
- > 13 years, 2nd dose 4-8 weeks later
Varicella Vaccine: Side Effects
- Local tenderness
* varicelliform rash within 1 month
Influenza Vaccine Administration
- First dose: 6 months
- Dose yearly – vaccine typically updated.
- After age 2, option of live-attenuated (nasal spray).
Influenza Vaccine Precautions
- Avoid in asthma, wheezing past 12 months, underlying medical conditions.
- Avoid if egg allergy.
Injectable Polio Vaccine (IPV) Administration
- Given intramuscularly
- 2 months, 4 months, 6-9 months, 4-6 years
- Minimum of 4 weeks between 1st and 2nd doses
Injectable Polio Vaccine (IPV) Side Effects
- VAPP with OPV
- Hypersensitivity
- Guillan-Barre??
Diphtheria, Tetanus and Pertussis Vaccine DTaP, TDaP, Td Administration
Diphtheria toxoid;Tetanus toxoid;Acellular pertussis
- Four primary doses and one booster
- Given intramuscularly
- Typically 2, 4, 6 months, and 12-18 months
- Booster at 4-6 years; or if dirty cut and less than 5 year since last booster
Diphtheria, Tetanus and Pertussis Vaccine DTaP, TDaP, Td Contraindications & Precuations
Contraindications
- Encephalopathy within 7 days of administration of previous dose Precuations
- Temperature >40.5° C within 48 hours of previous dose
- Collapse or shock-like state within 48 hrs of previous dose
- Seizures within 3 days of previous dose
- Persistent/inconsolable crying >3 hours within 48 hrs of previous dose
Meningococcal Vaccine - MCV4
- Meningococcal Conjugate Vaccine
- Administer at 11-12 yrs or the 7th grade physical
- A booster is given at college entry
Recombinant Products Vaccines
Hepatitis B Recombinant Products - A preparation of a weakened or killed pathogen, such as a bacterium or virus, or of a portion of the pathogen’s structure that upon administration stimulates antibody production or cellular immunity against the pathogen but is incapable of causing severe infection
Immunogenic Components of Bacteria Vaccines
Pertussis, Haemophilus influenzae type B, Streptococcus pneumoniae Toxoids – Diphtheria, Tetanus
Haemophilus influenzae, type B(Hib) Vaccine
Administration:
- Given Intramuscularly
- Can be given with other vaccinations
- 2, 4, and 6 months with booster at 12-15 months No contraindications and minimal side effects.
Inactivated/Killed Vaccines
Polio, Hepatitis A, Influenza
HPV Vaccine
- Quadrivalent vaccine against HPV Types 6, 11, 16, and 18
- Administer first dose to females/males 11-12 years or before they become sexually active
- Second dose at 2 months
- Third dose at 6 months
Passive Immunity
Trans-placental transfer of maternal antibodies Administration of antibodies, either as:Immunoglobulin, ORMonoclonal antibody
Heptatis A
- Minimum age is 12 months
- 2 doses, given at least 6 months apart, starting after 1 year of age
- Can be given to older children and adolescents
Common Vaccine Side Effects
- Localized tenderness
- Localized erythema
- Fever
- Fussiness
- Allergic reaction
Other Ingredients in Vaccine
- Suspending Fluids (saline, tissue culture)
- Preservatives
- Stabilizers
- Antibiotics (Prevent bacterial overgrowth)
- Adjuvants to enhance immunogenicity *All can contribute to local side effects and rarely, can cause anaphylaxis (egg antigens, antibiotics, gelatin)
Hepatitis B Vaccine Who gets it:
Universal hep B immunizations in infancy as well as children and adolescents who missed immunization during infancy or those who are at increased risk
Hepatitis B Vaccine Administration
Given IM (intramuscularly) 1st dose – at birth (within 12 hours) 2nd dose – 1-2 months 3rd dose – 6 months
Hepatitis B Vaccine Contraindications and Side Effects
Contrindications: none SE:Localized tenderness, rare hypersensitivity, reaction to yeast or vaccine preservatives
Live attenuated vaccinations
Measles, mumps, rubella, varicella Live Attenuated is the actual viruses – weakened or altered so that the child doesn’t get sick. These vaccines STING!
What is responsible for inflammation?
Inflamasome
Humoral adaptive or acquired immune system includes:
B Cells, plasma cells, antibody
Cellular adaptive or acquired immune system includes:
T cells, macrophages, neutrophils
80-90% of all immune responses occur through which branch of the immune system?
Innate
Histiocytes are macrophages in the:
Tissue
True/False: Mononuclear phagocytes have a role in both adaptive and innate immunity?
True
What is the predominant cell making up the white cell count?
Neutrophils
True/False: The host produces PAMPs.
False: host does not produce PAMPS so the innate system does not have to discriminate self from non-self.
What are PAMPs recognized by?
PRRs
PRRs on phagocytes results in: (4)
1) Phagocytosis2) Opsonization through acute phase proteins3) Elevated anti-microbial activity4) Up-regulation of A) adhesion molecules, B) Co-stimulatory molecules
What is opsonization?
INDIRECT RECOGNITION through opsonins: Enhanced phagocytosis that is usually mediated by ligands and receptors, that utilizes the process of phagocytosis. THE JELLY ON THE BREAD
Eosinophils are important in:
Parasitic infections, allergies
Mast cells are important in:
allergies and anaphylaxis: Contain pre-formed histamine
Basophils during inflammation release potent _________ that exacerbate the response. The granules stain ______
Mediators, blue
_____________ have high nuclear to cytoplasmic ratios and include T-cells, B-cells, and NK cells
Lymphocytes
What cells react with tumor cells and virally infected cells and kill them through apoptosis and enzymes?
Natural Killer cells
T/F: Acute phase proteins help in opsonization because cells have receptors for these acute phase proteins on their cell surface?
True
What is the major coordinator of inflammation and made up of over 20 different proteins?
Complement (Part of Innate Immune system)
A group of proteins that have an effect on other cells:
Interferons
T/F: Alpha or beta interferons infect adjacent cells?
False: They stop infection of adjacent cells
What interferon works through the adaptive immune response to activate T cells and macrophages?
Gamma interferon
In acute inflammation you tend to have higher numbers of what cells?
Neutrophils and activated T helper cells
In chronic inflammation you tend to have higher numbers of what cells?
Macrophages, t cytotoxic, and B cells
A glycoprotein secreted by a plasma cell that is specific for an epitope on an antigen is what?
An antibody
Fab is the fraction of _________ ___________ while Fc is fraction of _______________.
antigen binding, crystallization
T/F: The TCR is secreted
False- never secreted
T/F: T and B memory cells are produced following antigen stimulation?
True
The biologically relevant portion of an antibody is what?
Fc (Fraction of crystallization)
Antibodies functionality is conferred by: (4)
1) Fc receptors on cells2)Complement activation3) Complement receptors4) Placental transfer
T/F: IgM crosses the placenta
False
T/F: IgM is a pentamer
TRUE
T/F: IgM is first immunoglobulin secreted upon antigen stimulation
True
T/F: IgE has an extra piece on the Fc portion that makes it bind only to mast cells
True- In the absence of antigen
IgA is found in __________
Secretions
Ig__ functions as a marker of maturation
IgD
Genetic variability: ________ is conferred by the Fc portion. ____________ is minor genetic differences that are obtained from mom and dad. _______ is an antibody to the antigen combining site (the Vh and Vl)
Isotype, Allotype, Idiotype
T/F: If IgM is present in the baby, the baby is responding?
True: If IgG is present, do not know if it is from mom or baby
What thyroid hormone is the major product of the thyroid gland?
T4
What thyroid hormone is active at the cellular level?
T3biologically more active; shorter half life
Primary hypothyroidism affects what level?
Gland
Secondary hypothyroidism affects what level?
Pituitary
Tertiary hypothryoidism affects what level?
Hypothalamus
Describe the hypothalamic-pituitary-thyroid axis:
Hypothalamus releases TRH which stimulates pituitary. Pituitary releases TSH which acts on the thyroid. Thyroid hormones then exhibit NEGATIVE feedback on the pituitary and hypothalamus.
Describe the spectrum of presentation of hypothyroidism (3).
- Subclinical hypothyroidism (elevated TSH, normal T4)2. Symptomatic disease3. Severe myxedema coma
Etiologies of Primary Hypothyroidism (9)
- Autoimmune (Hashimotos)2. Idiopathic3. Post ablation 4. Post external radiation5. Thyroiditis (subacute, silent, postpartum)6. Infiltrative Disease (lymphoma, sacroid, amyloidosis, Tuberculosis)7. Congenital8. Iodine Deficiency9. Drug-induced hypothyroidism (Amiodarone, lithium)
Etiologies of Secondary Hypothyroidism (3)
caused by insults to the pituitary gland1. Neoplasm2. Infiltrative3. Hemorrhage into the gland
Etiologies of Tertiary Hypothyroidism (4)
- Neoplasm2. Infiltrative Disease3. Anorexia Nervosa4. Cerebrovascular or surgical insult
What causes systemic symptoms of hypothyroidism?
lack of T3
Frequent Signs and Symptoms of Hypothyroidism(all of the signs and symptoms are listed)
WeaknessEdema of faceLethargyCourse SkinSlow MovementsEdema of EyelidsSensation of ColdHoarsenessPeripheral EdemaDry SkinDecreased SweatingPallor of LipsSlow speechCold SkinConstipationThick TongueParesthesiasGain in weightMuscle WeaknessSlow cerebration
Typical Symptoms of Hypothyroidism (6)
fatigueweaknesscold intoleranceconstipationweight gaindeepening of voice
Cutaneous Symptoms of Hypothyroidism (4)
dry, scaly, yellow skinnon-pitting waxy edema of the facemyxedemathinning of eyebrows
Cardiac Symptoms (3)
bradycardiaenlarged heartlow voltage electrocardiogram
Hypothyroidism Symptoms in the Neck (5)
PainSwellingTendernessNodulesCystsor could be asymptomatic
Neurological Symptoms of Hypothyroidism (3)
ParesthesiaAtaxiaProlongation of DTR
Describe the hormone levels in HYPOthyroidism - TSH and T4
TSH: increased (normal 0.5-5.0 ug/mL)Free T4: low or low-normal (normal 0.7-1.86 ng/dL)thyroid is unable to produce sufficient quantities of hormone (low T4), so pituitary compensates further stimulating the thyroid (high TSH)
What is Hashimoto’s Disease? What markers will be present?
Autoimmune thyroiditisPositive test for antibodies - Anti-Tg and Anti-TPO10 x more common in women
What is subclinical hypothyroidism? How is it treated?
Elevated TSH with normal free T4TSH > 10: treatTSH 5-10: monitor or possible trial of hormone replacement
What is Acquired Transient Central Hypothyroidism also known as Euthyroid Sick Syndrome?
Extremely ill patients with non thyroidal illnessEuthyroid with elevated TSH but normal free T4It generally resolves without treatment, only treat if TSH > 10
What is Goiter?
Enlargement of Glandcan be uniform or diffuse; irregular or multi nodular
How is goiter managed?
- Suppression Therapy: thyroid hormone replacement, decreases TSH stimulation* Rapidly enlarging - biopsy* If hypo or hyper treat for the condition
Diagnostic Testing: Serum TSH
Primary HypothyroidismPrimary Hyperthyroidism (over-replacement of hypothyroid state)
Diagnostic Testing: Serum Free Thyroixine (FT4)
Estimates unbound (free) T4HIGH = HYPER LOW = HYPO
Diagnostic Testing: Total Thyroxine
thyroxine is protein bound - drugs and conditions can alter the levelHIGH = HYPERLOW = HYPO
Diagnostic Testing: Total and Free T3
useful for diagnosing HYPERthyroidism
Diagnostic Testing: Thyroglobulin
papillary or follicular thyroid cancermay indicate: recurrent tumor
Diagnostic Testing: Thyroid Antibodies
autoimmune conditionsHYPO: HashimotosHYPER: Graves
What thyroid diagnostic test should you order first in an asymptomatic patient?
TSH initiallyif HIGH - T4 to confirm HYPOif LOW - T4 and total T3 HYPER
What is thyroid diagnostic test should you order first in a symptomatic patient or patient with risk factors?
Both TSH and free T4
Lab Abnormalities in Hypothyroid Conditions: LIPIDS
increased triglycerides and cholesterolnormalizes with treatment
Lab Abnormalities in Hypothyroid Conditions: Cellular Enzyme Elevation
CK - suggests myopathyAST and LDH normalizes with treatment
Lab Abnormalities in Hypothyroid Conditions: Hyponatremia
associated with SIADHnormalizes with treatment
Which patients should be screened for thyroid disorders?
Patients with: Atrial fibrillation, Osteoporosis, Hyperlipidemia, Diabetes Mellitus, Down or Turner’s SyndromePatients Taking: Amiodarone or Lithium
Radioactive Iodine Uptake Imaging
I131 Used for the evaluation of Nodules”Hot” less likely to be malignant
RAIU - Increased Uptake
Grave’s Disease
RAIU - Decreased Uptake
Silent thyroiditisSubacute thyroiditisPostpartum thyroiditisExogenous hyperthyroidism
RAIU - What does hot nodule and cold nodule mean?
Hot - take up iodine - overactive; can overproduce thyroid hormoneCold - under active thyroid
Thyroid Ultrasound Uses
following nodulesdetermine character of noduleguidance of fine-needle aspiration
drugs that decrease TSH secretion (low serum TSH)
DopamineGlucocorticoids
drugs that INCREASE thyroid hormone secretion
IodineAmiodarone
drugs that DECREASE thyroid hormone secretion
LithiumIodineAmiodarone
drugs that DECREASE T4 absorption
Ferrous Sulfate
drugs that INCREASE TBG concentration
Estrogens
Management of Hypothyroidism
Lifelong replacement therapyAutoimmune causes - removal or ablation
Drug for Thyroid Replacement Therapy and Goal of Treatment
Levothyroxine - stay with same brand (bioequivalency issues)goal: normalize TSH (0.4-2.0 mIU/L)over-replacement if <0.3 risk osteoporosis and atrial fibrillation6-8 weeks to stabilize; once stable check every 6 months to yearly
Thyroid Replacement for Healthy Patients
full dose1.6 ug/kg/dayreassess TSH in 6-8 weeks
Thyroid Replacement in Elderly Patients or those with Cardiac Disease
start low and go slow
Signs and Symptoms of Hyperthyroidism
GoiterSweating of handsWeight lossTirednessPalpitationsRegular Pulse > 90Lid LagDyspnea on ExertionFinger TremorNervousnessExcessive SweatingHot HandsPreference for ColdExopthalmosHyperkinesisDiarrheaScant MensesAtrial Fibrillation
What is Apathetic Hyperthyroidism?
elderly patients present with minimal symptomology of hyperthyroidism
Signs and Symptoms of Graves Disease
Diffuse Nontoxic GoiterOphthalmopathy: stare, lid lag, exopthalamosDermopathy - pretibial myxedemaThyroid Acropachy - digital clubbing, periosteal reaction
Causes of Hyperthyroidism
GravesToxic Multinodular GoiterThyroid NoduleThyroiditisExogenous intakeMedications: Amiodarone; iodineRARE: adenoma, trophoblastic disease, stuma ovarii
Complications of Hyperthyroidism
Very distressingAtrial FibrillationCHF, Angina, MI, Sudden DeathOsteoporosis
Hyperthyroidism Treatments
Radioiodine ablative therapySub-total thyroidectomyAntithyroid drugsSymptom treatments
Radioiodine Ablative Therapy
most common treatment for Gravesgoal of treatment: Hypothyroidism
Sub-total Thyroidectomy
goal: leave enough gland to produce endogenous hormonespare: parathyroid glands, recurrent laryngeal nerves
Antithyroid Drugs
Propythiomuracil (PTU) and Methimazoledecrease the production of thyroid hormones - important to monitor hormone levelspreferred in pregnant patientsside effects: agranulocytosisseek immediate care for fever or sore throat
Symptomatic Treatment of Hyperthyroidism
B-Blockers: tremor and heart rateDiltiazem & Verapamil Clonidine** used until definitive treatment completed
What is Thyroid Storm?
Sudden severe exacerbation of thyrotoxicosisoften precipitated by trauma, infection, surgery
Symptoms of Thyroid Storm
feversevere tachycardiadelirium
Treatment of Thyroid Storm
antithyroid drugs: PTU or methimazolehigh dose glucocorticoidspotassium iodide to suppress further hormone release
Thyroid Nodule Risks for Malignancy
prior radiation< 30 years of age; > 60family history
Evaluation of Thyroid Nodule
TSH, Free T4 and T3Normal TSH: fine needle aspirationBenign: follow clinicallyMalignant: surgical referral
Multinodular Goiter
diffuse processidentified on physical examlow risk of malignancy
Subacute Thyroiditis
cause: postvirals&s: anterior neck pain; elevated ESRtx: symptomatic - analgesicstypically recover euthyroid
Painless Thyroiditis
autoimmune - leads to long term hypothyroidismno neck discomfortdecreased uptake of radio iodinepostpartum: w/in 1 year of deliverysilent: not associated w/ childbirth
FOUR Phases of Thyroiditis
HyperthyroidEuthyroidHypothyroidSome recover to a euthyroid state
- Which of the following is a cell in the body that is capable of differentiating to a plasma cell and secreting antibody: A. B cells B. Mast cells C. Natural Killer cells D. Neutrophils E. Platelets
A. B cells
- The movement of cells from the blood to a site of inflammation due to the release of inflammatory mediators: A. Chemotaxis B. Opsonization C. Phagocytosis D. Pavementing E. Pinocytosis
A. Chemotaxis
- Specificity and memory are the two major characteristics of: A. The adaptive immune system B. The complementary immune system C. The humorous immune system D. The indirect immune system E. The innate immune system
A. The adaptive immune system
- The immunoglobulin that is associated with allergic reactions: A. IgA B. IgD C. IgE D. IgG E. IgM
C. IgE
- The part of an antigen that is recognized by an antibody or T cell receptor: A. Agretype B. Allotype C. Epitope D. Idiotype E. Isotype
C. Epitope
- Which of the following is true of an IgG molecule: A. It actively crosses the placenta B. It has a secretory component C. It has 5 antigen binding sites D. It is a B cell surface immunoglobulin receptor for antigen that is pentameric in structure E. It is the antibody produced on first exposure to antigen
A. It actively crosses the placenta
- The process by which cells non-specifically engulf material and enclose it within a vacuole in the cytoplasm is known as: A. Chemotaxis B. Cytolysis C. Pavementing D. Phagocytosis E. Pragmatism
D. Phagocytosis
- The immunoglobulin that is found predominantly in secretions: A. IgA B. IgD C. IgE D. IgG E. IgM
A. IgA
- Which of the following cells plays a central role in the development of an immune response? A. Macrophages B. Neutrophil C. T-cytotoxic cell D. T-helper cell
D. T-helper cell
- General characteristics of the complement system includes proteins that are: A. Produced by the liver and circulate in the blood B. Produced only in response to antigenic stimulation C. Produced only in the spleen D. Specific for each antigen introduced to the immune system
A. Produced by the liver and circulate in the blood
- Which component is found in both the classical and alternative pathways and is central to complement activation? A. C1q B. C3 C. C5a D. C9
B. C3
- The sum of the attractive and repulsive forces of all antibodies binding to an antigen is: A. Affinity B. Cross –reactivity C. Non-reactivity D Specificity
A. Affinity
- Lysis of cells by complement is finalized by the formation of : A. C1q B. Immune Complexes C. Membrane Attack Complex (MAC) D. Properdin
C. Membrane Attack Complex (MAC)
- Which one of the following statements is TRUE concerning the secondary response to an antigen? A. No memory cells are produced B. The predominant response is IgG. C. The quantity of IgM antibody produced is higher than in the primary esponse D. The specificity of the antibody is different from the primary response.
B. The predominant response is IgG.
- Which of the following can be an antigen presenting cell through MHC Class II: A. Bacterial B. Macrophage C. Neutrophils D. Red blood cells E. T-cells
B. Macrophage
- The cell in the body that has the potential to become a B-cell or T-cell is: A. Bone marrow fibroblasts B. Common lymphoid progenitor C. Common myeloid progenitor D. Fetal liver endothelial cells
B. Common lymphoid progenitor
- T-cells receptors (TCR) and B-cell receptors (surface immunoglobulin) are similar as they: A. Acquire specificity through gene rearrangements B. Are heterodimers C. Have many receptors of only one antigenic specificity D. Have variable and constant regions E. All of the above
E. All of the above
- The binding energy between an antigen and antibody: A. Is non-reversible B. Is reversible C. Is unrelated to the laws of mass action D. None of the above
B. Is reversible
- The class or subclass of an immunoglobulin is determined by the: A. CH region B. CL region C. VH region D. VL region
A. CH region
- Polymorphonuclear granulocytes include: A. B-cells B. Endothelial cells C. Neutrophils D. T-cells
C. Neutrophils
- A T cell receptor recognizes processed antigen; whereas, a B cell receptor recognizes: A. 8-12 amino acids. B. Conformational antigens (approximately 125 amino acids). C. Denatured antigen. D. Linear antigens.
B. Conformational antigens (approximately 125 amino acids).
- Following antigen presentation by a B cell to a T helper cell, cytokines are produced and the B cell: A. Kills the T cell.. B. Rearranges its VDJ and VJ genes. C. Secretes antibody D. Undergoes class switching, becomes a plasma cell and secretes an antibody
D. Undergoes class switching, becomes a plasma cell and secretes an antibody
- Cells determine what peptides are to be presented to the immune system by: A. Chance contact B. Phagocytosis by the T cell receptor C. Presentation through Class I or Class II molecules that have peptides bound to them D. Protein synthesis E. Secreting antibody
C. Presentation through Class I or Class II molecules that have peptides bound to them
- Which one of the following is primarily part of the innate immune response? A. B cells B. Cilia C. T cells D. All of the above E. None of the above
B. Cilia
- The Fab region of the immunoglobulin molecule is important in: A. Activating complement following antibody binding to antigen B. Binding of cells to an antibody that is bound to an antigen C. Binding to an antigen D. Determining the class or subclass of antibody E. Placental transfer
C. Binding to an antigen
- Affinity maturation of the humoral immune response is due to: A. Continued stimulation of B cells by high levels of antigen B. DNA recombination by products of the D region genes C. Isotype switching D. Negative selection of T cells with the lowest helper potential E. Continued stimulation of B cells with low levels of antigen resulting in somatic mutation and the positive selection of B cells with the highest affinity for antigen
E. Continued stimulation of B cells with low levels of antigen resulting in somatic mutation and the positive selection of B cells with the highest affinity for antigen
- Lymphocytes acquire their antigen specificity: A. As they enter the tissues from the circulation B. Before they encounter antigen C. Depending on which antigens are present D. From contact with self antigen E. In the secondary lymphoid organs
B. Before they encounter antigen
- Phagocytosis: A. Can be enhanced by antigen binding to complement or antibody B. Is an antigen-specific process C. Must be preceded by antigen processing D. Rids the body of virus-infected cells E. Only occurs after plasma cells begin secreting antibody
A. Can be enhanced by antigen binding to complement or antibody
- In bacterial infections, T cytotoxic cells do not seem to be very important. This is because: A. They are resistant to the enzymes that T cytotoxic cells release when activated B. Bacteria do not express MHC Class I that is necessary for cytotoxic T cell recognition C. Bacteria do not express MHC Class II that is necessary for cytotoxic T cell recognition D. Bacteria do not express MHC Class I that is necessary for T helper cell recognition
B. Bacteria do not express MHC Class I that is necessary for cytotoxic T cell recognition
- Antigens normally expressed only on embryonic cells but also sometimes found on tumor cells fixed in early development are known as: A. Oncofetal antigens B. HTLV-1 C. Maternal D. Neonatal E. Cryptic
A. Oncofetal antigens
- In the treatment of leukemias, the process of bone marrow purging is performed by: A. Taking out the bone marrow and then just putting it back in B. Taking out the bone marrow, using antibody to the tumor to remove tumor cells and then putting the remaining cells back in C. Taking out the bone marrow, using antibody to the tumor to remove tumor cells and then putting the tumor cells back in D. Taking bone marrow from another cancer patient and putting it into the patient
B. Taking out the bone marrow, using antibody to the tumor to remove tumor cells and then putting the remaining cells back in
- An example of a known oncogenic virus is: A. Herpes zoster B. HIV-2 C. Epstein-Barr virus D. Vesicular stomatitis virus
C. Epstein-Barr virus
- The normal immunological control of tumors is normally through which response: A, Humoral immunity B. Cell mediated immunity C. Innate immune system D. Immunological senescence
B. Cell mediated immunity