Biomaterial Database

Virulence of Naegleria fowleri affected by axenic cultivation and passage in mice. 1993

D T John, and M J Howard

Department of Biochemistry and Microbiology, Oklahoma State University, College of Osteopathic Medicine, Tulsa 74107-1898.

The virulence of Naegleria fowleri decreases with prolonged axenic cultivation. The decline in virulence of highly virulent, mouse-passaged LEE strain amebae was monitored during 5 years of continuous axenic cultivation. The most rapid decrease in virulence occurred during the first 2 years. Virulence could be restored to original levels by 3 serial passages in mice. The composition of axenic media also affected the virulence of N. fowleri, with a more enriched medium appearing to restore some of the virulence of a weakly virulent strain.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D005856	Germ-Free Life	Animals not contaminated by or associated with any foreign organisms.	Axenic Animals,Gnotobiotics,Germfree Life,Animal, Axenic,Animals, Axenic,Axenic Animal,Germ Free Life,Gnotobiotic,Life, Germ-Free,Life, Germfree
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D012692	Serial Passage	Inoculation of a series of animals or in vitro tissue with an infectious bacterium or virus, as in VIRULENCE studies and the development of vaccines.	Passage, Serial,Passages, Serial,Serial Passages
D014774	Virulence	The degree of pathogenicity within a group or species of microorganisms or viruses as indicated by case fatality rates and/or the ability of the organism to invade the tissues of the host. The pathogenic capacity of an organism is determined by its VIRULENCE FACTORS.	Pathogenicity
D016848	Naegleria fowleri	A species of parasitic protozoa having both an ameboid and flagellate stage in its life cycle. Infection with this pathogen produces PRIMARY AMEBIC MENINGOENCEPHALITIS.	Naegleria fowlerus,fowlerus, Naegleria
D051379	Mice	The common name for the genus Mus.	Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus