CDC / SCIENCE PHOTO LIBRARY CDC / SCIENCE PHOTO LIBRARY
Virus research lab. Microbiologist using a lightbox to count viral plaques within fixed monolayers of cells. This is being done as part of the process to titrate a viral stock. He is wearing an air-tight self-contained positively-pressurised suit to protect him from possible contamination. Photographed in the Centers for Disease Control's (CDC) Biosafety Level 4 (BSL-4) laboratory, USA.
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