early antigen ( ea ) was first detected inside v-z virus-infected vero cells 4 to 6 hr after infection , whereas surface membrane antigen ( sma ) was expressed on the outer surface of infected cells 2 to 3 hr later than ea , and intranuclear late antigen ( la ) was detected several hours later than sma antigen .
C0042338
v-z virus
C0009450
infection