H. Influenzae Satellite Phenomenon

Mei 22, 2021 Posting Komentar

- culture on chocolate agar. The presence of extracellular hemin and NAD allow colonies of H.

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Background Haemophilus influenzae can grow on blood agar media with Staphylococcus aureus which can provide factor V as it is called Satellite phenomenon.

H. influenzae satellite phenomenon. Influenzae appear as convex smooth pale grey or transparent colonies. Aureus on blood agar plates. Influenzae can grow on chocolate agar plate prepared with heat-lysed horse blood or rabbit blood or on blood agar media with some bacteria such as Staphylococcus aureus coagulase-negative staphylococci CNS or enterococci which are capable of beta-haemolysis and which can provide factor V.

Influenzae will show Gram -negative coccobacilli with no specific arrangement. Satellitism Test for the Identification of Haemophilus influenzae. Characteristics of the colonies among H.

Tiny colonies growing around Saureus in a zone of staphylococcal beta-hemolysis. The phenomenon is known as Satellitism. Aureus releases nutrients vital to the growth of H.

Influenzae NAD factor V. Therefore Haemophilus spp may grow on sheep blood agar very close to the colonies of Staphylococcus aureus as it produces NAD-factor V. Grows as satellite colonies around S.

Satellitism test for the identification of Haemophilus influenzae Image source. Aureus lyse nearby red blood cells releasing hemin and NAD in the media. Influenzae displays the satellite phenomenon when grown near Staphylococcus aureus.

Influenzae and this test has been accepted as a conventional method for about a hundred years 1 2. Haemophilus influenzae will grow in the hemolytic zone of Staphylococcus aureus on blood agar plates. The hemolysis of cells by Saureus releases factor V which is needed for its growth.

Why Haemophilus needs X and V Factor. Parainfluenzae only needs the V factor. Blood agar growth is only achieved as a satellite phenomenon around other bacteria.

Please realize that HFLU needs both X and V. Influenzae cultured for 24 hours and 48 hours in TSA 231058 mm and 302077 mm blood agar 220069 mm and 234096 mm and Columbia agar 204059 mm and 255 067 mm base chocolate agar with p 0650 24. The NAD diffuses into the surrounding medium and stimulates the growth of Haemophilus influenzae in the vicinity of the staphylococcus.

This phenomenon is known as satelliting. - culture on chocolate agar. Haemophilus influenzae uses factor X to produce essential respiratory enzymes such as cytochromes catalases and peroxidase.

The satellite test with Haemophilus influenzae and Staphylococcus aureus on blood agar. This illness is not the same as the flu influenza which is caused by a virus. Blood agar growth is only achieved as a satellite phenomenon around other bacteria.

H influenzae meningitis is caused by Haemophilus influenzae type b bacteria. Microorganisms colony of hemolysin producing Staphylococcus aureus or Staphylococcus epidermidis strain. Th century the satellite test was found for presumptive laboratory diagnosis of H.

Haemophilus wont grow on blood agar except around S. Influenzae importance of diagnosis increases particulary for smallsized laboratories 6 8. Influenzae to grow in the immediate vicinity of S.

Haemophilus haemolyticus and Haemophilus parahaemolyticus are hemolytic variants of H influenzae and Haemophilus parainfluenzae respectively. Influenzae will grow in the hemolytic zone of Staphylococcus aureus on blood agar plates. Haemophilus influenzae is the major human pathogen in the group.

Influenzae colonies growing on the chocolate only. Influenzae appear as convex smooth pale grey or transparent colonies. Are small pleomorphic nonmotile nonsporing gram-negative rods or GNCB.

Hinfluenzae - growth factor requirement XV. Aureus lyses the RBC and provides the NAD required for Haemophilus growth-Most medically important species. For Haemophilus spp the satellite test substitutes for the V factor test.

You can observe this in a mixed culture with both Saureus and Hinfluenzae. Gram-stained and microscopic observation of a specimen of H. GNR causing bacterial pink eye with purulent discharge.

GramGram-stained stained and microscopic observation of a specimen of HH. This occurs when colonies of S. Influenzae will not grow outside the hemolytic zone of Staphylococcus aureus.

STD casuing painful genital ulcers chancroid H. Satellitism test or satellite test for Haemophilus influenzae is positive as shown above picture. On the BAP you will see tiny colonies satelliting around the Staph.

This cooperation is called Satellite phenomenon 1 2 5. Therefore Haemophilus spp may grow on sheep blood agar very close to the colonies of Staphylococcus aureus as it produces NAD-factor V. Hparainfluenzae - growth factor requirement V.

Influenzae will show Gram-negative coccobacilli with no specific arrangement. This phenomenon is known as satelliting. Before the Hib vaccine H influenzae was the leading cause of bacterial meningitis in children under age 5.

They are aerobic and facultatively anaerobic and addition of 510 carbon dioxide to the incubation atmosphere may enhance growth. You will see tan H. Influenzae cant grow on Blood agar as it lacks the growth factors X and V but in special case the growth is only achieved as a satellite phenomenon around other bacteria for example H.

H influenzae does not grow on sheep blood agar except around colonies of staphylococci satellite phenomenon. This test uses to identify Haemophilus influenzae. In the early 20.

This is known as satelliting. The hemolysis of erythrocytes by S. Clinical sample of Haemophilus influenzae Blood agar and Chocolate agar Sterile sticks or inoculating loop.

It is a fastidious organism and thus needs extra ingredients like hemin factor X and NAD factor V to grow.

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