Taxis response is to move towards or away from the stimulus. If the organism moves towards the stimulus the taxis is positive, while if it moves away the taxis is negative. For example, flagellate protozoans of the genus "Euglena" move towards a light source. This reaction or behaviour is called "positive phototaxis", since phototaxis refers to a response to light and the organism is moving towards the stimulus. Many types of taxis have been identified, including: Depending on the type of sensory organs present, a taxis can be classified as a "klinotaxis", where an organism continuously samples the environment to determine
HACEK organisms of all cases of this disease. HACEK originally referred to "Haemophilus parainfluenzae", "Haemophilus aphrophilus", "Actinobacillus actinomycetemcomitans", "Cardiobacterium hominis", "Eikenella corrodens", and "Kingella kingae". However, taxonomic rearrangements have changed the A to "Aggregatibacter" species and the H to "Haemophilus" species to reflect the recategorization and novel identification of many of the species in these genera. Some reviews of medical literature on HACEK organisms use the older classification, but recent papers are using the new classification. A list of HACEK organisms: All of these organisms are part of the normal oropharyngeal flora, which grow slowly (up to 14 days), prefer a carbon