OBG

• mc overall cause of abortion = genetic factors
• mc related to 2nd trimister = anatomical abnormilities
• maximum risk of transmission in 1st trimester = rubella
• maximum risk if infection occus before 20 weeks = varicella zoster
• maximum risk if infection occurs after 18 to 20wks = syphilis
• no relation to gestational age =CMV
• maximum risk of  transmission during delivery = hiv & herpes
• Least risk of transmission during delivery = toxoplasmosis
• Rate of transmission increases as pregnancy advances = toxoplasmosis & hepatitis