What is Brucella species?
Brucella species are small, aerobic, Gram-negative coccobacilli that are animal pathogens of worldwide distribution.
What are Haemophilus species?
Haemophilus species are Gram-negative coccobacilli similar in ultrastructural features to other pathogenic bacilli. Haemophilus influenzae requires hemin (factor X) and NAD+ (factor V) for growth. Other Haemophilus species require only NAD+ and therefore grow on blood agar.
How can you tell Brucella species?
Species are differentiated by production of urease and H2S, dye sensitivity, cell wall antigens and phage sensitivity. The major species are divided into multiple biovars.
Which species of Brucella is most common?
Of the 4 Brucella species known to cause disease in humans (B abortus, B melitensis, B canis, B suis), B melitensis is thought to be the most virulent and causes the most severe and acute cases of brucellosis; it is also the most prevalent worldwide.
What does Brucella species cause?
Brucellosis is a disease, caused by bacteria, which affects many different kinds of animals – including sheep, goats, cattle, deer, elk, pigs, and dogs. However, it can also cause a disease with flu-like symptoms in humans. People with brucellosis may develop fever, sweats, headaches, back pains, and physical weakness.
How do you distinguish Haemophilus species?
H. influenzae can be identified using Kovac’s oxidase test and determining the necessity of hemin and NAD as growth requirements. If the oxidase test is positive, hemin and NAD growth factor requirement testing should be performed. If the growth factor requirement test indicates that the isolate may be H.
What is the meaning of Haemophilus?
Haemophilus is the name of a group of bacteria. There are several types of Haemophilus. They can cause different types of illnesses involving breathing, bones and joints, and the nervous system. One common type, Hib (Haemophilus influenzae type b), causes serious disease. It usually strikes children under 5 years old.
How many species of Brucella are there?
There are seven Brucella species of terrestrial origin, namely Brucella abortus, Brucella melitensis, Brucella suis, Brucella canis, Brucella ovis, Brucella neotomae, and Brucella microti, and two species of marine origin, namely Brucella ceti and Brucella pinnipedialis.
How do H. influenzae and H Aegyptius differ?
H. aegyptius strains were clearly differentiated from strains of H. influenzae by their inability to grow on tryptic soy agar containing X + V factors, by their susceptibility to trooleandomycin, by a distinct bacillary morphology, and, in part, by not fermenting xylose.
Is Haemophilus Gram positive or negative?
Photos of the Bacteria and Images of People Affected by the Disease. Cerebrospinal fluid culture positive for Haemophilus influenzae type b (Gram stain). Infant with severe vasculitis with disseminated intravascular coagulation (DIC) with gangrene of the hand secondary to Haemophilus influenzae type b septicemia.
How do you get Haemophilus?
How is Hib disease spread? Hib disease may be transmitted through contact with mucus or droplets from the nose and throat of an infected person.
What kind of bacteria is Haemophilus influenzae?
Haemophilus influenzae is a bacteria characterized as a small, facultatively anaerobic, pleomorphic, and capnophilic gram-negative coccobacillus of the family Pasteurellaceae. It is a common cause of a variety of invasive and non-invasive bacterial infections.
What tests may be employed to differentiate Haemophilus species?
haemolyticus using only biochemical tests very difficult and other methods, such as molecular testing, may be employed for differentiating between the two species.
Is Haemophilus contagious?
People spread H. influenzae, including Hib, to others through respiratory droplets. People who are infected spread the bacteria by coughing or sneezing, which creates small respiratory droplets that contain the bacteria. Other people can get sick if they breathe in those droplets.