VM UPM-LC-TEAM7 : Streptococcus pyogenes by Effa Zakiah

Characteristics of Streptococcus pyogenes

effaabdullah — 2017-03-24 11:39:04 UTC

Hi everyone! I have found so many characteristics of our microbe that we choose for this project which is Streptococcus pyogenes. So, I want to share some of the characteristics here. Firstly, this bacteria have a round cocci shape with the diameter about 0.6 to 10 micrometer in various measurement of length. It is a Gram positive bacteria that grows in pairs or chains. For the reaction in blood agar, it is a Beta-hemolysis which appear as a translucent colony with a zone of hemolysis surrounding the colony. Streptococcus acidophilus gives a negative result on Catalase-test because there is no production of gas after adding 3% of hydrogen peroxide. Here is a website that shows the result for biochemical test, properties and identification of Streptococcus pyogenes! Have a look!

Pathology of Streptococcus pyogenes

nadyatira04 — 2017-03-28 01:41:41 UTC

Hello everyone :)

I would like to share on pathology of Streptococcus pygenes.
Streptococcus pyogenes is an unusually successful pathogen because of many different properties. First of all, the organism is able to adhere to the cells of its host with strong adhering mechanisms, which is important because the organism would be easily removed by mucus or salivary fluid. The more adhesions there are, the stronger the adherence will be.

Not only does Streptococcus pyogenes adhere to its host cells, but it also invades them. This have shown that “group A streptococci have the potential to invade human epithelial cells at frequencies equal to or greater than classical intracellular bacterial pathogens.” There are two proteins necessary for invasion, which are the M protein and the SfbI, which is a fibronectin-binding protein.

Streptococcus pyogenes affects its hosts in many different ways and causes a large range of diseases. The Center for Disease Control and Prevention (CDC) reports some symptoms of the diseases caused by Streptococcus pyogenes. They range from mild to severe, such as fever, severe pain, dizziness, and red rash at wound site. The symptoms at first might not seem severe, but in some cases the diseases have caused death to certain individuals.

Here, i would like to attach an article that i found in online text book of bacteriology. I found that this article consists a lot of information and very interesting. Let me know if this article is good or otherwise. If you have any suggestion or comment, don't hesitate to share here, okay.

THANK YOU :)

First video recording

effaabdullah — 2017-03-28 06:33:21 UTC

Mind map

effaabdullah — 2017-04-09 11:26:28 UTC

Ecology

Firdauskun26 — 2017-04-10 17:15:40 UTC

Assalamualaikum and Hai everyone.
I would like to add something about the ecology of this microbe Streptococcus pyogenes that was distributed in the environment.
First thing about the relationship the Streptococcus pyrogenes and the others Streptococcus. Streptococcus pyrogenes can be inhibited by the Streptococcus salivarius. The others Streptococcus is the Streptococcus pneumoniae. Streptococcus pyrogenes has same resistance with S. pneumoniae to antibiotic like erythromycin.
Next is the place that we can found this at mucosal epithelium of the oropharynx, rectum, tend reside extracellularly but can be also found in mammalian respirotary tract and epidermal layer of the skin.
Lastly about the factor of infection. Climate is an important risk factor for the different forms of streptococcal disease. The example is Pharyngitis is highly prevalent during the winter months that effect during that time. Next is Impetigo, mostly encountered during warm and humid weather conditions. This was very influence to high infection of this microbe.
That all from me about the ecology of the Streptococcus pyrogenes. Thank you --(Firdaus).

Reproductive traits of S. pyogenes

humairahshahidan — 2017-04-11 07:11:02 UTC

Assalammualaikum and hellooo everyone!! I'm Humairah and I want to share about the reproductive traits of S. pyogenes.
So, actually there are many ways or places of S. pyogenes to reproduce and one of the main place is cows and also us, humans.
Humans are primary reservoir for this bacterium.Cows infected by humans are intermediate hosts and can pass the bacterium in their milk, which, if consumed unpasteurized, can infect other humans.
The bacterium can be spread to cattle and then back to humans through raw milk as well as through contaminated food sources (salads, milk, eggs). However, cattle do not contract the disease.

But, the interesting facts about S. pyogenes is it also can survive outside the host in a few places for examples:
* ice cream for 18 days
* room temperature butter for 48 hours
* neutralized butter for 12-17 days
* raw and pasteurized milk at 15-37 ºC for 96 hours
So, be careful and always remember S. pyogenes when you grab an ice cream..hehehehe ><

addition information about Streptococus pyogenes

raihanramli — 2017-04-12 06:11:50 UTC

hi everyone..i would like to share some information that i have found about this bacteria..i also hope that all of this information can help you to be more understand about this bacteria, Streptococcus pyogenes...huhuhu.

what i want to focus on this time is about the genome of this bacteria..let start with the genome structure of S. pyogenes ..before i explain more about genome...

do you understand the meaning of genome??
A genome is an organism’s complete set of DNA, including all of its genes. Each genome contains all of the information needed to build and maintain that organism.
The genome of an M1 strain of Streptococcus pyogenes has been sequenced, and was found to contain 1,852,442 base pairs and about 1,752 predicted protein-encoding genes. Also, more than 40 putative virulence associated genes have been identified, and this could explain why Streptococcus pyogenes is considered responsible for a wider variety of human disease than any other bacterial species. GAS was found to produce a large number of extracellular proteins that increase the virulence of the organism by triggering a severe nonspecific immunological response in the human host.
for better understanding..all of you can click this link to read the preview about the article..
http://www.jstor.org/stable/3055485?seq=1#page_scan_tab_contents

Next, is about the virulence and the virulence factor.Let's break this term down...the virulence means the ability of a pathogens to cause disease process to occur in our body. while the virulence factor is the agents that used by pathogens to sneak disease in our body system. They give them access into our bodies and allow them to establish a place to reside...this the the journal's link about the research in the virulence factor of S. pyogenes...
http://www.sciencedirect.com/science/article/pii/S1349007912000497
>>i hope that all this information can benefits all of us in the study of S. pyogenes.....okay that all from me..bye
THANK YOU "-"