Varicella (chickenpox): A highly infectious viral disease, known familiarly as chickenpox. (In many countries, this disease is always called "varicella.")
Chickenpox has nothing at all to do with chicken. The name was meant to distinguish this "weak" form of the pox from smallpox. "Chicken" is used here, as in "chickenhearted," to mean weak or timid. The "pox" of chickenpox is no major matter unless it becomes infected (through scratching) or occurs in an immunodeficient person.
However, there can be very major problems from chickenpox including pneumonia and encephalitis and reactivation of the same herpes virus is responsible for shingles (zoster). Chickenpox is responsible for more deaths than measles (rubeola), mumps, whooping cough (pertussis) and H. flu (Haemophilus influenzae type B) meningitis combined. Chickenpox is by no means a mild disease.
The rationale for childhood chickenpox vaccination is not just to protect the children but also to protect everyone with whom they come in contact, including adults (who can die from the chickenpox) and pregnant women (so that the unborn baby does not get chickenpox).
Source: www.medterms.com/script/main/art.asp?articlekey=5957, hope this helps?
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