Neonatal herpes

Neonatal herpes is a serious viral infection found in newborn babies. It is caused by the herpes simplex virus, which is often called HSV. This virus can cause different health problems depending on how it affects the baby's body. Understanding this condition is vital because it can impact a newborn's organs or nervous system. Doctors work hard to identify the virus early to provide life-saving care.

The infection typically begins through vertical transmission. This means the virus moves from a mother to her baby. Most cases, about 85%, occur during childbirth. This happens when the baby touches infected genital secretions in the birth canal. About 5% of infections happen in utero, meaning before birth. The remaining 10% are acquired postnatally, which means after the baby is born. Risk increases if a mother has a new infection during her third trimester.

Medical professionals categorize the disease into three distinct types. The first type is skin, eye, and mouth herpes, or SEM. This localized form causes external lesions but does not affect internal organs. The second type is disseminated herpes, known as DIS. This type affects internal organs, and it particularly targets the liver. The third type is central nervous system herpes, or CNS herpes. This type infects the brain and the nervous system, which can lead to encephalitis.

Each type presents different symptoms and risks for the infant. SEM herpes often shows up on areas of skin trauma. These might include sites where medical tools like forceps were used during delivery. DIS herpes is serious because it affects vital organs. CNS herpes is also very dangerous and can cause seizures or tremors. Babies with CNS herpes may also show lethargy or a bulging fontanelle, which is the soft spot on the skull. While SEM has the best prognosis, DIS has a higher mortality rate.

History shows that medical progress has changed the outlook for these babies. In the United States, the death rate from neonatal HSV is currently decreasing. The current death rate is about 25%. This is a major change from a few decades ago. Back then, the death rate for untreated cases was as high as 85%. This improvement is largely due to antiviral treatments like acyclovir and vidarabine. These medicines help fight the virus if they are given in time.

Diagnosis can be quite difficult for doctors to manage. This is because transmission is asymptomatic in 60% to 98% of cases. This means many babies show no visible signs of the virus at first. Doctors use blood tests and cultures to find the virus. They may take swabs from the mouth, nose, eyes, or anus. They might also use PCR, a way to find the virus's genetic material. For babies with suspected CNS involvement, doctors may use an MRI or a CT scan.

Statistics help us understand how common this condition is globally. It is estimated to affect one in 10,000 births around the world. In the United States, about 1 in every 3,500 babies contract the infection. Research shows that HSV-1 causes 62.5% of known cases. In industrialized nations, the rates of HSV-1 are changing. As adolescent exposure to the virus drops, more young women are becoming active without existing antibodies. This shift has led to an increase in HSV-1 neonatal herpes in developed countries.

Neonatal herpes is connected to many other medical topics and risks. For example, about 50% of cases involve prematurity, where the baby is born at 38 weeks or less. About one-quarter of cases also involve sepsis, which is a serious infection in the blood. Doctors must also distinguish herpes from other conditions. These include bacterial meningitis or other viral infections like cytomegalovirus. Managing the risk often involves making decisions about how a baby is delivered. For instance, doctors may recommend a caesarean section if a mother has active lesions during labor.