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.

Photo credit: CDC

Source:CDC's Public Health Image Library Image #5610

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. eesti ∙ Deutsch ∙ čeština ∙ español ∙ português ∙ English ∙ français ∙ Nederlands ∙ polski ∙ slovenščina ∙ suomi ∙ македонски ∙ українська ∙ 日本語 ∙ 中文（简体）‎ ∙ 中文（繁體）‎ ∙ العربية ∙ +/−