A VDRL reactive mother gave bih to an infant. All of the following would help in determining the risk of transmission to the infant, Except

Positive TPHA mother is responsible for transmission of infection to the infant In infants, no test (even TPHA) can show the difference between asymptomatic infected and noninfected. VDRL -- detect antibody titer raised in both infants and mother suggests the transmission 4 weeks before delivery treatment should be completed so time interval is the impoant factor. Ref: Ananthanarayana textbook of Microbiology 9th edition Pgno : 374