Viral Rash in Pregnancy

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	Rubella	ParvoVirus	ChickenPox
Susecptible	3-9%	40%	<10%
Immune	90%	60%	>90%
Infectivity Mother	90%	50%	70-90%
Intrauterine Infection	<11 wk—90% 11-16 wks—55% >16wks —45%	<4wks—0% 5-16wks— 15% >16wks— 25-75%	<28wk—5-10% 28-36wks— 25% >36wks — 50%
Poor Fetal outcome	<11wk —90% 11-16wk — 20% 16-20wk — none	<20 wks  Hydrops 3% (50% die) Incr loss 9%	FVS  <13wks 0.4% 13-20wks 2% 4 day before & 2 day after delivery— 20%
Incubation Period	14-21 day	14-21 day	10-21 days
Infectivity time	7 days pre rash 10 days post rash	10 days pre rash to day of rash onset	2 days pre rash untill vesicles crust
Incidence	2-3/1000	1:512 Seroconversion 1.5-13%	2-3/1000
Babies with defect	1 per yr	2-8 hydrops per million preg	30 per yr severe CP