Billion Plaque Forming Units

**Semantic type:** Quantitative Concept

**Definition:** A measure of viable infectious entities expressed in billions in the specimen or product defined as the smallest quantity that can produce a cytopathic effect in the host cell culture challenged with the defined inoculum, visible under the microscope or/and to the naked eye as a plaque.

**Synonyms:** - 10*9{PFU} - 10*9{PFU} - 10E9 PFU - 10^9 PFU - 10^9 PFU - 10^9{PFU} - 10^9{PFU} - 10^9{PFU} - 10^9{pfu} - 10^9{pfu} - 10^9{pfu} - Billion PFU - Billion PFU