We report a case of a 55-year-old immunocompromised female who presented to the emergency department with severe diarrhea and vomiting following travel to the Philippines. Stool bacteriology revealed a mixed infection involving an enteropathogenic Escherichia coli and two distinct strains of enteroaggregative Escherichia coli (EAEC). During hospitalization, urine and blood culture tested positive for one of the diarrheagenic EAEC strains, necessitating urinary catheterization, intensive care, and antimicrobial treatment with trimethoprim-sulfamethoxazole, followed by meropenem. Although known to occasionally cause urinary tract infections, EAEC have not been previously associated with sepsis. Our report highlights the potential of EAEC to cause severe extraintestinal infections.

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A quadtree is a spatial data structure which has four branches attached to the branch point or node. The records exist in the leaf nodes of the tree. An octree is the same concept except the branches are in groups of eight. An octree can represent and image by subdividing the cubical volume. The quadtree tree is greatly used for two-dimensional space and the octree is used for three-dimensional space. Historical BackgroundThe name quadtree has developed through time. It was once called a Q-tree and then later termed quadtree. It was adapted from the binary search tree in order to be used for two dimensions. The name octree simply comes from the prefix "oct" and the word tree. These data structures were needed in order to save space. These structures were first built as pointers, but have now evolved to use leaf nodes encoded by a locational code. Scientific FundamentalsA quadtree is a class of spatial data structure methods used to put and/or locate files or records in a database. There is a base node which is split along d dimensions producing 2 d children. Quadtrees are based on the rule of four, and therefore the order of the tree is four and there are four