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.
History of Costa Rica. The first natives in Costa Rica were hunters and gatherers, and Costa Rica served as an Intermediate Region between Mesoamerican and Andean native cultures. In 1502, Christopher Columbus made landfall in Costa Rica. Soon after, his forces overcame the indigenous people. He incorporated the territory into the Captaincy General of Guatemala as a province of New Spain in 1524. For the next 300 years, Costa Rica was a colony of Spain.