<prompt> Peri-natal transmission of hepatitis B is maximum in:1st trimester2nd trimester3rd trimesterDuring labour and delivery  <response>: Peri-natal transmission of hepatitis B is maximum in 3rd trimester. Maximum chances of perinatal transmission :- Disease Maximum chances Varicella 1 trimester Rubella 1 trimester Syphilis III trimester Toxoplasmosis III trimester Hepatitis B III trimester HIV During delivery 