Changes

'''****''''''TCID50/mL represents the viral load at which 50% of cells are infected when a solution containing the virus is added to the cell culture. The detection limit is expressed in TCID50/mL and copies/TCID50 for H1N1 is 2,3811,048copies/TCID50 corresponding to 1.0510-1TCID50/mL.'''</sub></div>