Microbiology laboratory and the management of mother-child varicella-zoster virus infection

Table 3 Prenatal congenital varicella syndrome diagnosis combining ultrasoonography and a search for varicella-zoster virus DNA in amniotic fluid[90]

Weeks of pregnancy	VZV DNA in amniocentesis	Ultrasound	Risk of CVS
Initial
17-21	Positive	Normal	Uncertain
Follow-up
23-24	Positive	Normal	Unlikely
	Positive	Abnormal	High
15-22/> 23	Negative	Normal	Low

VZV: Varicella-zoster virus; CVS: Congenital varicella syndrome.