“…Proof of intrauterine infections, irrespective of whether or not CVS develops, can be deduced from the detection of VZV DNA in the fetus or neonate, the presence of specific IgM in fetal or cord blood, the persistence of specific IgG beyond 7 months of age and the development of HZ during infancy. 30,33 Nearly 20% of infants with intrauterine acquisition of VZV infection develop neonatal or infantile HZ, which is usually uncomplicated. 21 Although fetal serological detection of specific IgM is useful in confirming evidence of intrauterine infection, in general, serology has a low sensitivity and is therefore unreliable, and is not recommended for the diagnosis of CVS caused by maternal chickenpox.…”