Anaerobic, Gram-positive cocci; common members of the indigenous microflora of the gastrointestinal tract, vagina, and oral cavity; opportunistic pathogens that cause various infections, including abscesses, oral infections, and appendicitis.
Peptostreptococcus
Gram-negative bacilli; common members of the indigenous microflora of the oral cavity and gastrointestinal tract; opportunistic pathogens that cause various infections, including abscesses, oral infections, and bite wound infections.
Porphyromonas
Anaerobic, Gramnegative bacilli; common members of the indigenous microflora of the vagina and gastrointestinal tract; opportunistic pathogens that cause various infections, including abscesses
Prevotella
Members of the family Enterobacteriaceae; Gram-negative bacilli; facultative anaerobes; common members of the indigenous microflora of the colon; opportunistic pathogens; a fairly common cause of cystitis.
Proteus
. An aerobic, Gram-negative bacillus; produces a characteristic blue-green pigment (pyocyanin); has a characteristic fruity odor; causes burn wound, ear, urinary tract, and respiratory infections; one of the major causes of healthcare-associated infections; most strains are multidrug resistant and resistant to some disinfectants.
Pseudomonas aeruginosa
. Gramnegative bacilli that are obligate intracellular pathogens; unable to grow on artificial media; the causative agents of typhus and typhuslike diseases (e.g., Rocky Mountain spotted fever); all rickettsial diseases are transmitted by arthropods (ticks, fleas, mites, lice)
Rickettsia
Members of the family Enterobacteriaceae; Gramnegative bacilli; facultative anaerobes; a fairly common cause of food poisoning, especially cases caused by contaminated poultry; Salmonella typhi is the causative agent of typhoid fever
Salmonella
Members of the family Enterobacteriaceae; Gram-negative bacilli; facultative anaerobes; a major cause of gastroenteritis and childhood mortality in the developing nations of the world
Shigella
(staf-ih-low-kok-us awree-us).(See “A Closer Look at Staphylococcus aureus” in the
Staphylococcus aureus
Also known as group B streptococcus; a _- hemolytic, Gram-positive coccus; often colonizes the vagina; a frequent cause of neonatal meningitis.
Streptococcus agalactiae
(strep-toh-kok-us new-mohnee-ee). (See “A Closer Look at Streptococcus pneumoniae”
Streptococcus pneumoniae
(strep-toh-kok-us pyoj-uh-nees).
Streptococcus pyogenes
A very thin, tightly coiled spirochete; the causative agent of syphilis.
Treponema pallidum
An aerobic, curved (comma-shaped), Gram-negative bacillus; halophilic; lives in salt water; the causative agent of cholera
Vibrio cholerae
A Gramnegativebacillus; the causative agent of plague in humans, rodents,and other mammals; transmitted from rat to rat and rat to human by the rat flea
Yersinia pestis