,HISTORY OF PRESENT ILLNESS:, This 6-week-old infant was doing well until about 48 hours prior to admission, developed irritability, fussiness, a little bit of vomiting, and then fever up to 103-degrees. 
,HISTORY OF PRESENT ILLNESS : , This 6 - week - old infant was doing well until about 48 hours prior to admission , developed irritability , fussiness , a little bit of vomiting , and then fever up to 103 - degrees .