If someone says the word “Herpes”, everyone cringes. Surprisingly, about 2/3 of you reading
this now, may have had HSV 1 (the type that causes cold sores), and about 20% of you may
have had the genital type of Herpes (HSV2).
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Herpes Virus Infection in Pregnancy
1. Herpes Virus Infection in Pregnancy
If someone says the word “Herpes”, everyone cringes. Surprisingly, about 2/3 of you reading
this now, may have had HSV 1 (the type that causes cold sores), and about 20% of you may
have had the genital type of Herpes (HSV2). Most people who get exposed to herpes are
asymptomatic and may not even know they had it. The way we can tell if you have been
exposed to this virus before is to measure your immunoglobulins (IGG) against the herpes
virus.
Most episodes of HSV during pregnancy are recurrent, and are a very low risk to affect the
baby. Transmission occurs through mucous membranes or open or abraded skin. The virus
lives in the neurons where it entered near the spine. Recurrent clinical outbreaks occur
infrequently, and may involve trauma, UV radiation, change of temperature, pregnancy,
stress, immunosuppression or hormonal changes.
2. Infection presents with papules, pustules, vesicles and ulcers that last 2-6 weeks
The fetus becomes infected by a virus shed from the cervix or lower genital tract. It either
invades the uterus during membrane rupture or is transmitted by contact with the fetus during
delivery. Neonatal herpes is caused by both herpes simplex types 1 and 2, although herpes
simplex type 2 infection predominates. Most infected infants are born to mothers who have no
reported infection.
3. How it affects You/Pregnancy?
The risk of neonatal infection correlates with the presence of HSV in the genital tract, the
stage of maternal infection and invasive obstetrical procedures. If the pregnant woman
acquires a new infection near the time of delivery the infant has a 30- to 50- fold increased
risk of infection due to higher viral load and the lack of protective antibodies. While women
with recurrent HSV have less than a 1-percent risk of neonatal infection.
How it affects the mother?
Only 1/3 of newly acquired Herpes infections are symptomatic. The incubation period of 2-10
days followed by eruption that is papular with itching and tingling, which then becomes painful
and vesicular. Transient flu-like symptoms are common. Although very rare, life threatening
herpes infection may develop in the mother (disseminated disease) with encephalitis,
hepatitis and pneumonia may develop. All signs of infection disappear in 2-4 weeks. Many
women do not present with the typical lesions, some may have pruritic or abraded areas
others may have knife-slit lesions that may sting, or be itchy.
4. How it affects the baby?
Neonatal transmission occurs during pregnancy in about 5% of cases, during labor and
delivery around 85% and after delivery around 10%.
The most concerning HSV infection during pregnancy occurs in those with a primary/first
episode infection in early pregnancy. These are associated with an increased risk of preterm
labor, IUGR (intrauterine growth retardation), spontaneous abortion or stillbirth. Premature
infants account for 2/3 of the cases of neonatal HSV.
Late-pregnancy infection has been associated with preterm labor and delivery. 80% of
mothers of infected infants have no reported infection. This often occurs because the mother
is unaware that she was infected, or exposed to a partner with HSV. Epidemiologic studies
suggest that most sexual transmission of genital herpes occurs when persons shed virus but
lack lesions. Both men and women can shed the virus, without visible lesions on their
genitals.
Primary/first episode infection during pregnancy is associated with microcephaly and neonatal
chorioretinitis; rarely skin lesions. The risk of fetal transmission with HSV primary infection is
about 60%. 20% of those with neonatal HSV have long-term neurologic sequelae.
Treatment and Prevention
Specific antiviral medications have been used successfully to attenuate the infection and
reduce viral shedding. In those women with a history of prior HSV (recurrent HSV), and
recurrent outbreaks, suppressive therapy with daily antiviral treatment has been used
successfully to reduce outbreaks, decrease viral shedding, and decrease neonatal HSV.
Antiviral treatment with medication such as Acyclovir appears to be safe in pregnant women.
If women at term with a history of HSV, present with prodromal symptoms of HSV infection
such as vulvar burning or itching, and careful examination of the vulva, vagina and cervix
should be done to evaluate for the presence of lesions. Cesarean section is indicated for
those with only active genital lesions or prodromal symptoms. However even after cesarean
section, some infants are born with HSV. Postnatal treatment with antiviral medications are
given for neonatal herpes infection.
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