2.3.2. Haemagglutination inhibition test
i) Dispense 0.025 ml of PBS into each well of a plastic V-bottomed microtitre plate.
ii) Place 0.025 ml of serum into the first well of the plate.
iii) Make twofold dilutions of 0.025 ml volumes of the serum across the plate.
iv) Add 4 HAU of virus/antigen in 0.025 ml to each well and leave for a minimum of
30 minutes at room temperature (i.e. about 20°C) or 60 minutes at 4°C.
v) Add 0.025 ml of 1% (v/v) chicken RBCs to each well and mix gently, allow the RBCs to
settle for about 40 minutes at room temperature, i.e. about 20°C, or for 60 minutes at 4°C
if ambient temperatures are high, by which time control RBCs should have formed a
distinct button.
vi) The HI titre is the highest dilution of serum causing complete inhibition of 4 HAU of
antigen. The agglutination is assessed by tilting the plates. Only those wells in which the
RBCs stream at the same rate as the control wells (containing 0.025 ml RBCs and 0.05 ml
PBS only) should be considered to show inhibition.
vii) The validity of results should be assessed against a negative control serum, which should
not give a titre >1/4 (>22 or >log2 2 when expressed as the reciprocal), and a positive
control serum for which the titre should be within one dilution of the known titre.
2.3.2. Haemagglutination inhibition testi) Dispense 0.025 ml of PBS into each well of a plastic V-bottomed microtitre plate.ii) Place 0.025 ml of serum into the first well of the plate.iii) Make twofold dilutions of 0.025 ml volumes of the serum across the plate.iv) Add 4 HAU of virus/antigen in 0.025 ml to each well and leave for a minimum of30 minutes at room temperature (i.e. about 20°C) or 60 minutes at 4°C.v) Add 0.025 ml of 1% (v/v) chicken RBCs to each well and mix gently, allow the RBCs tosettle for about 40 minutes at room temperature, i.e. about 20°C, or for 60 minutes at 4°Cif ambient temperatures are high, by which time control RBCs should have formed adistinct button.vi) The HI titre is the highest dilution of serum causing complete inhibition of 4 HAU ofantigen. The agglutination is assessed by tilting the plates. Only those wells in which theRBCs stream at the same rate as the control wells (containing 0.025 ml RBCs and 0.05 mlPBS only) should be considered to show inhibition.vii) The validity of results should be assessed against a negative control serum, which shouldnot give a titre >1/4 (>22 or >log2 2 when expressed as the reciprocal), and a positivecontrol serum for which the titre should be within one dilution of the known titre.
การแปล กรุณารอสักครู่..
