Causes of Pyometra. Pyometra is an infection that is caused by Escherichia coli, which is a bacterium that is normally present in healthy amounts in the uterus of the dog. When there is an overgrowth of the Escherichia coli bacteria, the uterus infection occurs; this may be 2 months after the estrus.
Central America is not its own continent, but is considered part of North America geographically. Costa Rica, while being in Central America, is technically part of North America. The North American continent ends at either the Panama/Colombia border or the Panama Canal, depending on the convention you accept.
Costa Rica maintains an embassy in the United States at 2114 S Street NW, Washington, DC 20008 (tel. 202-480-2200). More information about Costa Rica is available from the Department of State and other sources, some of which are listed here: Department of State Costa Rica Page Department of State Key Officers List CIA World Factbook Costa Rica Page