01/10/2026
๐ช๐๐๐ก ๐๐๐๐ง๐๐ฅ๐๐ โ๐๐๐ฆ๐๐ฃ๐ฃ๐๐๐ฅโโฆ ๐๐ฅ๐ ๐ง๐๐๐ฌ ๐ฅ๐๐๐๐๐ฌ ๐๐ข๐ก๐?
When bacteria are not detected through routine culture methods, does it mean they are no longer alive?
Not necessarily. Some bacteria can enter a state known as Viable But Non-Culturable (VBNC), where they remain alive but cannot grow under routine laboratory culture conditions.
Environmental stress, including low temperature, nutrient starvation, drying, pH changes, UV radiation, and chemical exposure, can trigger this survival response in certain microorganisms.
Although VBNC cells may not form visible colonies under routine culture conditions, they can retain metabolic activity and other characteristics associated with microbial viability.
Under favourable conditions, some VBNC cells may also return to an active and culturable state through a process known as resuscitation.
This highlights an important distinction in microbiological testing:
๐ก๐ข ๐๐ฅ๐ข๐ช๐ง๐ ๐๐ข๐๐ฆ ๐ก๐ข๐ง ๐๐๐ช๐๐ฌ๐ฆ ๐ ๐๐๐ก ๐ก๐ข ๐ฉ๐๐๐๐๐ ๐ ๐๐๐ฅ๐ข๐ข๐ฅ๐๐๐ก๐๐ฆ๐ ๐ฆ โ ๐ฉ๐๐๐๐๐๐๐ง๐ฌ ๐๐ก๐ ๐๐จ๐๐ง๐จ๐ฅ๐๐๐๐๐๐ง๐ฌ ๐๐ฅ๐ ๐ก๐ข๐ง ๐ง๐๐ ๐ฆ๐๐ ๐.
In this week's ๐๐๐ข๐๐ง๐๐ ๐ข๐ง ๐
๐จ๐๐ฎ๐ฌ, we explore what happens when bacteria enter the VBNC state, how environmental stress can influence microbial survival, why conventional culture methods may not detect all viable microorganisms, and how alternative detection methods help researchers investigate microbial viability.
Swipe through to explore the science behind the VBNC state and why โnot detectedโ does not always mean โgone.โ
