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parasitology Lecture 4
na
15
Microbiology
Graduate
09/10/2012

Additional Microbiology Flashcards

 


 

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Term
B cell 
Definition

lymphocytes that make antibodies to attack antigens on parasite coat (humoral immune response)

-     activated by Th2 cells or T-independent antigens

-       transformed into plasma cells, plasmas secrete IgM antibodies

-       if activated by T-ind. Cell, limited to creating IgM (not IgG)

-       immune response enhanced through T-ind cells

-       “Acquired immunity”

Term
T cell 
Definition

white blood cells that play role in immunity

-       send out signals (interleukens) to Th1 sites (cell-mediated responses) and Th2 sites (antibodies responses)

-       Th1 site turns on cytotoxic T cells/macrophage, Th2 activates B cells

Term
Cytokines 
Definition

cell-signaling protein molecules secreted by cells for intercellular communication

            - signal functions against intracellular pathogens (lysis, digestion, inflammation)

Term
Lymphokines 
Definition

groug of cytokines produced by T cells to signal immune response between cells

Term
Interleukins 
Definition

group of cytokines expressed by white blood cells for          communication

- T cells send out interleukin signals to Th1 sites (cell-mediated) or Th2 sites (humoral) to activate immune responses

Term
Complement 
Definition

combines antigen antibody complexes

- system that helps “complements” the ability of antibodies and phagocyctic cells to clear pathogens

Term
Variant antigen 
Definition
antigen that are capable of varying to avoid immune resp. 
Term
non-variant antigens 
Definition
antigens that are not capable of varying 
Term
Immunosuppression 
Definition
reduced immunity system, reduced immunity efficiency 
Term
Card agglutination test for trypanosomiasis (CATT) 
Definition

stain dead trypanosomes and mix it with blood, if blood clumps then body has developed antibodies, indicating that the disease is present inside the body

            - can give false-positive, so usually followed up with another diagnostic test such as blood smear or lumbar puncture

Term
Agglutination 
Definition

clumping of red blood cells in the presence of an antibody

 

Term

Winterbottom’s sign 

Definition

swollen lymph nodes around the neck

-       major sign of african trypanosomiasis disease

-       not every case has swelling around neck, but they will have swelling on other lymph nodes on body

Term
Anemia 
Definition

decrease in red blood cell count

-       Normal healthy ~50% red blood cells

-       Trypo infected ~ 20% red blood cells

-       Red blood cells being destroyed because homotype antigen population is being shed, but the red blood cells recognize these antigens and stick to them 

Term
Glomerulonephritis 
Definition

inflammation of glomeruli (kidney), because so much antigen being produced that red blood cells binding to antigens, causes agglutination in glomeruli, causing swelling

-       glomeruli part of kidney is used to filter waste/fluids from blood

-       so much surface coat from parasite is being shed that there is an accumulation of antigens in the glomeruli

-       ton of red bloods cells bind to antigens and accumulate in glomeruli, causing agglutination

-       agglutination red blood cells causes swelling

Term
Sterile male technique 
Definition

gamma eradiate adult flies and then release them        into nature, population will not be able to reproduce therefore controlling spread

            - difficult tecniques bc thre are 30 different species of tsetse flies, so you would     have to create/reaise large amount of many different species

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