Measles syndrome, atypical (AMS) definition - medical term
An altered
expression of measles, AMS begins
suddenly with high fever, headache, cough, and abdominal
pain. The rash may appear 1 to 2 days later, often
beginning on the limbs. Swelling (edema) of the hands and
feet may occur. Pneumonia is common and may persist for 3
months or more.
AMS occurs in persons who were incompletely
immunized against measle. This may happen if a person were
given the old killed-virus measles vaccine (which does not
provide complete immunity and is no longer available); or
the person were given attenuated (weakened) live measles
vaccine that was, by accident, inactivated during improper
storage. Immunization with inactivated measles virus does
not prevent measles virus infection. It can, however,
sensitize a person so that the expression of the disease is
altered, resulting in AMS.
Being atypical, AMS can be
confused with other entities including Rocky Mountain
spotted fever, meningococcal infection, various types of
pneumonia, appendicitis, juvenile rheumatoid arthritis,
etc.
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