Public Domain Picture: Magnified 100x, this 1977 photograph depicted a Petri dish filled with trypticase soy agar medium containing 5% defibrinated sheep's blood,

By: CDC/ Richard R. Facklam, Ph.D., Courtesy: Public Health Image Library

Views: 605 | Downloads: 2

Magnified 100x, this 1977 photograph depicted a Petri dish filled with trypticase soy agar medium containing 5% defibrinated sheep's blood,

This work, identified by PublicDomainFiles.com, is free of known copyright restrictions.

Title:

Magnified 100x, this 1977 photograph depicted a Petri dish filled with trypticase soy agar medium containing 5% defibrinated sheep's blood,

Description:

Magnified 100x, this 1977 photograph depicted a Petri dish filled with trypticase soy agar medium containing 5% defibrinated sheep's blood, i.e., blood agar plate (BAP). A loop of diluted culture of Streptococcus pyogenes was put into the melted agar (50oC) just before the blood was added to the melted agar. The melted agar with blood was allowed to solidify, and then incubated at 35oC for 24 hours in a normal atmosphere. The culture grew subsurface bacterial colonies, one of which was seen here. The characteristic color changes, i.e., a colorless region surrounding each colony in which the red blood cells in the blood agar medium had been destroyed, or "hemolyzed", indicated that these bacteria were indeed beta-hemolytic in nature.Infection with GAS can result in a range of symptoms:- No illness- Mild illness (strep throat or a skin infection such as impetigo)- Severe illness (necrotizing faciitis, streptococcal toxic shock syndrome)

Creator:

CDC/ Richard R. Facklam, Ph.D.

Source:

Public Health Image Library

Views:

605

Downloads:

Date Added:

November 27, 2012

Download: Original

Size: 1845 x 1204
File size: 6.0 MB
File type: tif

Free

Download: Largest

Size: 1845 x 1204
File size: 725.2 KB
File type: jpg

Free

Download: Small

Size: 958 x 625
File size: 60.7 KB
File type: jpg

Free

Why is this picture in the Public Domain?

Produced by United States Government

The file available on this page is a work of the United States government. A work of the United States government, as defined by United States copyright law, is "a work prepared by an officer or employee of the U.S. government as part of that person's official duties." In general, under section 105 of the Copyright Act, such works are not entitled to domestic copyright protection under U.S. law.

Where is this picture from?

Public Health Image Library

Created by a Working Group at the Centers for Disease Control and Prevention (CDC), the PHIL offers an organized, universal electronic gateway to CDC's pictures. They welcome public health professionals, the media, laboratory scientists, educators, students, and the worldwide public to use this m

View more information & files

How may I use a Public Domain picture?

The file available on this page in the Public Domain. Files in the public domain have no restrictions on use and may be used for any purpose, without any conditions, commercial or not, unless such conditions are required by law.

Possible Prohibited Uses

Although a file is in the public domain, the work may still have some restrictions for use if it contains any of the following elements:

File contains an identifiable person and such person has not provided a model release.
File contains an identifiable building or structure and the owner of such building has not provided a property release.
File contains a registered corporate logo or trademark.

Files containing any of the above elements that do not also have a provided release would generally fall under editorial uses only and may not be used for commercial purposes. Users downloading files that are designated as "editorial use" assume full responsibility for their use of the file(s). Depending on your use, the use of editorial use files may require additional rights that publicdomainfiles.com or the copyright owner may or may not be able to provide. You should consult with your legal counsel to be sure your use is legal.

Download Agreement

By downloading this file, you indicate that you understand and agree to all of these terms and assume full liability for your use of the file(s) and agree to hold publicdomainfiles.com harmless should any liability arise.