What is the relation between EID50 and TCID50?

Answer 1

Egg Infected dose 50% Vs. Tissue Culture Infectious Dose 50%

Two ways of testing for virus. One with eggs and one with tissue.

Answer 2

EID50 (50% endpoints infectious dose) is used to measure the amount of virus causing infection in the host, while TCID50 (50% tissue culture infectious dose) is used to measure virus infectivity in cell culture. They both represent the viral titer required to produce a specific response (infection) in a biological system, but EID50 is usually used for animal models, while TCID50 is used for experiments conducted in cell cultures.