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 lies within the tropics, around ten degrees north of the equator. This means that days and nights are roughly the same lengths throughout the year. And that temperatures are based on elevation and microclimates rather than latitude. There are no seasons, no spring, summer, autumn, winter. Costa Rica has the wet season and the dry season.