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File:CDC microbiologist demonstrating how to candle an embryonated chicken egg.tiff

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This 2008 photograph depicted a CDC microbiologist, as she was demonstrating how one properly “candles” an embyonated chicken egg, which employs a very bright light that is either placed behind the egg, such as was done throughout history by using a candle, hence the name, or employing more modern methods, using a powerful lamp placed against the broad end of the egg, as was the case here. In this way, the contents of the egg are revealed through the translucent shell. By using this procedure, she was able to access the viability of each egg used in the isolation of influenza viruses.

If the egg is unfertilized, as in PHIL 10147, the observer will see only a round yolk sac, and no developing embryo, or any network of blood vessels. Unfertilized eggs are known as “yolkers”. Eggs known as “quitters”, had been fertilized, but the embryo had stopped growing. In the case of quitters, one will note a thin blood ring encircling the yolk, as seen in PHIL 10148. “Winners” are eggs that had been fertilized, and lead to the growth of a healthy embryo, which is seen in PHIL 10149. In this case, one will observe numbers of networked blood vessels surrounding the yolk, and depending upon the length of gestation, one might see a dark shadow representing the developing embryonic eye.
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This media comes from the Centers for Disease Control and Prevention's Public Health Image Library (PHIL), with identification number #10759.

Note: Not all PHIL images are public domain; be sure to check copyright status and credit authors and content providers.

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  • Content Provider(s): CDC/ Laura R. Zambuto
  • Photo Credit: James Gathany

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This image is a work of the Centers for Disease Control and Prevention, part of the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.

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current03:30, 29 June 2012Thumbnail for version as of 03:30, 29 June 20121,200 × 1,806 (5.56 MB)Alex T. (talk | contribs){{Information |Description= This 2008 photograph depicted a CDC microbiologist, as she was demonstrating how one properly “candles” an embyonated chicken egg, which employs a very bright light that is either placed behind the egg, such as was done ...

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