In 2006 the monitoring of up-to-date percentage of ticks infected with the aetiological agents of Lyme borreliosis and meningoencephalitis in the selected areas on the territory of Prague continued. The monitoring is purposefully aimed at the monitoring of activity of natural infection focuses under the Capital City conditions. The text is based on the chapter Monitoring of Lyme borreliosis and meningoencephalitis agents in ticks published in yearbook Prague Environment 2006. More