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, 11:02, 23 May 2010
Image sourced form CDC, Wikimedia Commons, the image is in the public domain.
This electron micrograph depicts the retrovirus, Feline Leukemia Virus (FeLV). FeLV is a very common, often fatal feline disease passed from one cat to another via adversarial bites, or when one cat sneezes on another, or shares a food bowl. A cat may be vaccinated in order to protect it from acquiring this virus.