Epidemiological studies repeatedly have demonstrated the importance of a number of variables in affecting the incidence of the sudden infant death syndrome (SIDS).1.2 Characteristically, the peak risk of SIDS is within the second to third month of life, with relatively few cases in the first month of life or after the first year. Another consistent observation is the association between minor upper respiratory tract inflammatory processes(nasopharyngitis) and SIDS: relatively more SIDS victims than controls have had clinical symptoms referable to the upper respiratory tract one to two weeks prior to death. Furthermore, histologic examinations have revealed upper respiratory tract

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