Measles may be said to be nearly endemic in communities of children by reason of the regularity of its appearance at certain seasons of the year, and its peculiar partiality for definite age periods. Amongst the diseases of childhood it is conspicuous at times for its great mortality where associated with conditions of poverty and overcrowding. The small, spasmodic outbreaks which occur amongst an urban population may be said to be cyclical, and depending on the arrival of a number of children at the susceptible age period. These localized epidemics are not in themselves of importance from the point of severity or complication; the attack is generally mild and the healthy child does not suffer from complications or resulting ill effects. The seasonal outbreak of measles of a low type of virulence is a different disease from that witnessed at times in the fulminating epidemics. In these the manifestation is
CRASTER CV. ANALYSIS OF ONE THOUSAND CASES OF EPIDEMIC MEASLES. Am J Dis Child. 1913;VI(2):122–130. doi:10.1001/archpedi.1913.04100320059008
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