[Distribution of patterns of sensitivity and associated phenotypes of resistance in nosocomial and community acquired Escherichia coli during 2005].

Introduction: The increase of resistances to Escherichia coli over recent years has made it necessary to know the patterns of sensitivity in a certain area in order to be able to orient adequate empirical treatment with this knowledge.

Method: Prospective longitudinal study using E. coli isolations obtained during year 2005 in the University Hospital Virgen de la Victoria was performed.

[Microbiological, clinical and epidemiological aspects of Streptococcus pneumoniae isolates recovered over two years].

Introduction: Streptococcus pneumoniae is the most frequent cause of non-hospital acquired pneumonia and meningitis in adults, and bacterial otitis media in children. Moreover, it causes a third of all acute sinusitis cases. Penicillin has been the treatment of choice for almost 50 years.

Papillary carcinoma of the thyroid with mucoepidermoid differentiation.

A case of papillary carcinoma of the thyroid with mucoepidermoid differentiation is reported. There have been different hypotheses of the histogenesis of this tumor, one of which attributes the origin of the tumor to the ultimobranchial body, mainly because of the presence of neuroendocrine markers. In our case, no neuroendocrine immunohistochemical markers were demonstrated, but a progressive transition between follicular cells and mucinous cells with gradual loss of thyroglobulin immunoreactivity and acquisition of polyclonal carcinoembryonic antigen reactivity was noted.

[Primary pyomyositis in mild climates. Presentation of 2 new cases].

Pyomyositis is an acute bacterial infection which affects striated muscles. It is a relatively rare process in mild climates. Staphylococcus aureus is responsible for 90-95% of cases.