For pregnant women infected with Zika virus, the newborn child may have microcephaly.Other potential complications following viral encephalitis include:
Encephalopathy
Flaccid paralysis
Impaired intelligence
Low blood sodium level
Mononeuropathy
Mood and behavioral changes
Residual neurological deficits

Epidemiology
While the etiology of many cases of encephalitis is unknown, viruses account for about 70% of confirmed encephalitis cases, with the herpes simplex virus being the most common cause at about 50% of encephalitis cases. The incidence of viral encephalitis is about 3.5 to 7.5 per 100,000 people, with the highest incidence among the young and the elderly. Viral encephalitis caused by some viruses, such as the measles virus and the mumps virus, has become less common due to widespread vaccination. For others, such as Epstein-Barr virus and cytomegalovirus, incidence has increased due to the increased prevalence of AIDS, organ transplantation, and chemotherapy, which have increased the number of immunocompromised people who have weakened immune systems or who are susceptible to opportunistic infections. Time of the year, geography, and animal, including insect, exposure are also important. For example, arbovirus infections are seasonal and cause viral encephalitis at the highest rate during the summer and early fall when mosquitos are most active. Similarly, those who live in warm, humid climates where there are more mosquitos are more likely to experience viral encephalitis. Prevention
As many encephalitic viruses are transmitted by mosquitos, many prevention efforts revolve around preventing mosquito bites. In areas where such arboviruses are widespread, people should use protective clothing and should sleep under a mosquito net. Removing containers of stagnant water and spraying insecticides can be beneficial.
Wandering spleen (or pelvic spleen) is a rare medical disease caused by the loss or weakening of the ligaments that help to hold the spleen stationary. Symptoms and signs
Although symptoms include an enlargement in the size of the spleen, or a change from the spleens original position to another location, usually in either other parts of the abdomen or into the pelvis. This ability to move to other locations is commonly attributed to the spleens pedicle being abnormally long.Physical factors may cause ischuria, constipation, as well as numerous spleen-related diseases such as hypersplenism, thrombocytopenia, and lymphoma. Blocking of the arteries and torsion (twisting that interrupts the blood supply to that organ) in the spleen can also result in abdominal pain or swelling. However, lack of visible symptoms — except in incidents of abdominal pain — makes the disease difficult for doctors to diagnose, though medical imaging techniques such as medical ultrasonography, magnetic resonance imaging, or computed tomography can be used to confirm its occurrence. Characteristics of the disorder include the loss, weakening, or malformation of the ligaments that help to keep the spleen located in the upper left part of the abdomen. Cause
Though not a genetic disease, wandering spleen is often found at birth. It can occur in  adults as the result of injuries and other similar conditions that cause the ligaments to weaken, such as connective tissue disease or pregnancy. Wandering spleen (splenoptosis) predisposes the spleen to complications such as torsion, splenic infarction, pancreatic necrosis and rarely pseudocyst formation.