In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall.
Actinomyces is a genus of the Actinomycetia class of bacteria. They all are Gram-positive. Actinomyces species are facultatively anaerobic, and they grow best under anaerobic conditions. Actinomyces species may form endospores, and while individual bacteria are rod-shaped, Actinomyces colonies form fungus-like branched networks of hyphae. The aspect of these colonies initially led to the incorrect assumption that the organism was a fungus and to the name Actinomyces, "ray fungus".
Actinomycosis is a rare infectious bacterial disease caused by Actinomyces species. The name refers to ray-like appearance of the organisms in the granules. About 70% of infections are due to either Actinomyces israelii or A. gerencseriae. Infection can also be caused by Streptomyces somaliensis and Propionibacterium propionicus. The condition is likely to be a polymicrobial anaerobic infection.
This list contains species first discovered in Hong Kong, with the endemic species asterisked.
Eggerthella is a bacterial genus of Actinomycetota, in the family Coriobacteriaceae. Members of this genus are anaerobic, non-sporulating, non-motile, Gram-positive bacilli that grow singly, as pairs, or in short chains. They are found in the human colon and feces and have been implicated as a cause of ulcerative colitis, liver and anal abscesses and systemic bacteremia.
Etlingera elatior is a species of herbaceous perennial plant. Botanical synonyms include Nicolaia elatior, Phaeomeria magnifica, Nicolaia speciosa, Phaeomeria speciosa, Alpinia elatior, and Alpinia magnifica.
Mount Nicholson is a 430 m (1,411 ft) tall mountain located in Wan Chai District, on Hong Kong Island, Hong Kong. The hill is believed to be named for Hong Kong Volunteer Corps Adjunct Lieutenant W.C.A. Nicholson.
Aggregatibacter actinomycetemcomitans is a Gram-negative, facultative anaerobe, nonmotile bacterium that is often found in association with localized aggressive periodontitis, a severe infection of the periodontium. It is also suspected to be involved in chronic periodontitis. Less frequently, A. actinomycetemcomitans is associated with nonoral infections such as endocarditis. Its role in aggressive periodontitis was first discovered by Danish-born periodontist Jørgen Slots, a professor of dentistry and microbiology at the University of Southern California School of Dentistry.
The Actinomycetaceae are a family of bacteria in the order Actinomycetales that contains the medically important genus Actinomyces. These organisms are closely related to the mycobacteria, but were originally classified as fungi because they were thought to be transitional forms between bacteria and fungi.
Drechslera is a genus of fungi. Many of the species in this genus are plant pathogens.
Thismia is a genus of myco-heterotrophic plants in family Burmanniaceae, first described as a genus in 1845. It is native to East and Southeast Asia, New Guinea, Australia, New Zealand, and the Americas.
Annulatascus is a genus of fungi in the Annulatascaceae family of the Ascomycota. The relationship of this taxon to other taxa within the Sordariomycetes class is unknown, and it has not yet been placed with certainty into any order. The genus is characterized by taxa that are saprobic on submerged, decaying plant material in freshwater habitats. Morphologically the taxa possess dark brown to black perithecia, long tapering hyaline septate paraphyses, eight-spored asci with relatively massive J- apical rings, and ascospores that may or may not possess gelatinous sheaths or appendages. There are currently 17 species included in the genus.
Laribacter hongkongensis is a species of bacteria. It is facultatively anaerobic, non-sporulating, gram-negative, seagull- or spiral rod-shaped. It is a potential human pathogen. Laribacter hongkongensis has been isolated from human cases of diarrhea, but its role in causing diarrhea is unproven, even though it has been hypothesized. Additional studies are needed to better define its role as a possible enteric pathogen. These should include: case control studies designed to differentiate infection from colonization-transient passage, fulfilling Koch's postulates and Bradford-Hill's criteria on association vs. causation, possible virulence factors, animal models, host factors, antibody responses based on serodiagnostic testing, and human volunteer studies. The lessons learned from trying to establish the etiological role of the bacteria genera Aeromonas, Plesiomonas, and Edwardsiella in human diarrhea seem especially applicable for Laribacter. All four genera are isolated from extraintestinal infections, are apparently found in the aquatic environment, and epidemiological associations include eating fish and foreign travel. Even after over 50 years’ experience with the former three genera their etiological role in an individual case of human diarrhea is difficult to determine without extensive studies. For all four of these genera the critical issue will be differentiating infection from colonization or transient passage in the intestine.
Schaalia georgiae is a species in the genus Schaalia. It is a part of the human periodontal flora.
Alkanindiges hongkongensis is a gram-negative, aerobic, nonmotile bacterium of the genus Alkanindiges, which was isolated from the parotid abscess of a patient.
Winkia neuii is a species of Gram-positive, rod-shaped bacteria within the genus Winkia. It is known to live commensally on and within humans as part of normal, healthy microbiota of the human vagina
Laribacter is a bacterial genus in the family of Neisseriaceae. Laribacter hongkongensis is the only species in the genus, and it has been isolated from human cases of diarrhea. However, its role in causing diarrhea is unproven, even though it has been hypothesized.
Anaerospora is a Gram-negative genus of bacteria from the family of Sporomusaceae with one known species.
Christensenella hongkongensis is a species of clinically relevant gram-positive coccobacilli, first isolated from patients in Hong Kong and Canada in 2006. Although the species remains relatively rare, it has a high mortality rate of up to 50%. Christensenella is thought to be broadly distributed globally, as it has been isolated from patient blood cultures around the world including Hong Kong, South Korea, New Zealand, Canada, Sweden, France and Italy. Fewer than 15 cases of C. hongkongensis have been observed worldwide.
Dictyosporium is the type genus of fungi belonging to the family Dictyosporiaceae. By an estimate in 2018 it is formed by 45 species.
