Our expert says:
Herpes encephalitis is caused by the same virus that causes fever blisters. It usually causes infection by direct contact (touch) so herpes encephalitis, which is a rare disease in itself is not contagious by being in the same room as the sick person unless you have supressed immunity (low white cell count, HIV or immune deficiency disease). However I think you should avoid kissing your dad or touching any obvious blisters he may have due to the Herpes virus.
With the swine flu doing the rounds, rather see your doctor if you have symptoms of fever, sore muscles, coughing and runny nose that does not get better with symptomatic treatment. "The usual" seasonal flu normally won't harm your baby if you don't get complications like secondary infections.
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